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gcse inheritance

Total questions: 132

Worksheet time: 2hrs 21mins

Name
Class
Date
1.

Men have which sex chromosome

a)

X only

b)

Y only

c)

X & X

d)

X & Y

2.

Women have which sex chromosome

a)

X only

b)

Y only

c)

X & X

d)

XY

3.

Female gametes have which sex chromosome

a)

X

b)

Y

c)

XX

d)

XY

4.

Male gametes have which sex chromosomes

a)

X

b)

Y

c)

XX

d)

XY

5.

A girl will inherit which sex chromosome from her father

a)

X

b)

Y

c)

X or Y

d)

XY

6.

A girl will inherit which sex chromosome from her Mother

a)

X

b)

Y

c)

X or Y

d)

XY

7.

A boy will inherit which sex chromosome from his Mother

a)

X

b)

Y

c)

X or Y

d)

XY

8.

A boy will inherit which sex chromosome from his Father

a)

X

b)

Y

c)

X or Y

d)

XY

9.

What are the chances of having a boy or a girl?

a)

75%

b)

90%

c)

50%

d)

10%

10.

XX sex chromosomes are found in

a)

Males

b)

Females

11.

XY sex chromosomes are found in

a)

Males

b)

Females

12.

If a couple have a child who is female, what are the chances that their second child will be male?

a)

50%

b)

100%

c)

75%

d)

25%

13.

________ is how a trait appears, or is expressed. The part we can see.

a)

Dominance

b)

Genotype

c)

Phenotype

d)

Polygenic Inheritance

14.

_______ are the different forms of a gene.

a)

Duplicates

b)

Genes

c)

Pairs

d)

Alleles

15.

A ________ is a section on a chromosome that has genetic information for one trait.

a)

Duplicate

b)

Gene

c)

Pair

d)

Allele

16.

The chromosomes inside you exist as ________, one from each of your parents.

a)

Duplicates

b)

Genes

c)

Pairs

d)

Alleles

17.

Scientists learned that __________ contain genetic information that controls traits.

a)

Chromosomes

b)

Genes

c)

Pairs

d)

Alleles

18.

One offspring does not affect the __________ of another offspring.

a)

Pedigree

b)

Phenotype

c)

Complete Dominance

d)

Genetic Make-up

19.

A __________ is a model used to predict possible genotypes and phenotypes of offspring.

a)

Pedigree

b)

Punnett Square

c)

Codominance

d)

Genetic Make-up

20.

_________ is when the two alleles of a gene are different. Rr

a)

Heterozygous

b)

Genotype

c)

Phenotype

d)

Homozygous

21.

__________ is when the two alleles of a gene are the same. RR and rr

a)

Heterozygous

b)

Genotype

c)

Phenotype

d)

Homozygous

22.

In __________, uppercase letters represent dominant alleles and lowercase letters represent recessive alleles.

a)

Cells

b)

Genotypes

c)

Genetics

d)

Symbols

23.

Scientists use _________ to represent alleles in a genotype.

a)

Genes

b)

Phenotypes

c)

Codominance

d)

Symbols

24.

__________ is the two alleles that control the phenotype of a trait.

a)

Genotype

b)

Phenotype

c)

Codominance

d)

Pairs

25.

"T" is dominant, "t" is recessive. If an organism has the genes "Tt."

Which will trait will result?

a)

"T" dominant

b)

"t" recessive

26.

"G" is dominant, "g" is recessive. If an organism has the genes "gg."

Which will trait will result?

a)

"G" dominant

b)

"g" recessive

27.

"M" is dominant, "m" is recessive. If an organism has the genes "MM."

Which will trait will result?

a)

"M" dominant

b)

"m" recessive

28.

Emily has brown hair.

Which most likely explains why Emily has brown hair?

a)

Emily’s favorite color is brown.

b)

Emily has a parent with brown hair.

c)

Emily’s older brother has brown hair.

29.

What should you use to predict the traits of offspring when you know the genes of two parents?

a)

a graph

b)

a flow chart

c)

a data table

d)

a Punnett square

30.

What is the probability of bb offspring?

a)

1/4

b)

2/4

c)

0/4

d)

4/4

31.

What allele combination should go in the missing box?

a)

AA

b)

Aa

c)

aa

d)

none of these

32.

An allele whose trait ALWAYS shows up in the organism as long as 1 allele is present.

a)

dominant

b)

recessive

c)

phenotype

d)

genotype

33.

An allele whose trait can be hidden (masked) if a different allele is present.

a)

dominant

b)

recessive

c)

phenotype

d)

genotype

34.

Represented by a capital letter.

a)

phenotype

b)

dominant allele

c)

recessive allele

d)

homozygous

35.

Green pod color is dominant over yellow pod color. The green pod allele is written as 'G.' How would you write the allele for yellow pod color?

a)

Y

b)

y

c)

G

d)

g

36.

An organism's physical appearance or visible traits.

a)

homozygous

b)

heterozygous

c)

genotype

d)

phenotype

37.

An organism's genetic makeup or allele combination.

a)

genotype

b)

phenotype

c)

dominant allele

d)

recessive allele

38.

An organism that has 2 identical alleles for a trait.

a)

dominant allele

b)

homozygous

c)

heterozygous

d)

phenotype

39.

A heterozygous genotype will ALWAYS express this phenotype.

a)

dominant

b)

recessive

c)

cannot be determined

40.

Which of the following would be an example of a correctly written heterozygous genotype?

a)

Gg

b)

Gy

c)

GG

d)

gg

41.

Round seed shape is dominant over wrinkled seed shape. Which of the following would be a recessive genotype?

a)

rr

b)

RR

c)

Rr

d)

wrinkled seed

42.

Tall plant height is dominant over short plant height. Which of the following would produce a short plant?

a)

TT

b)

Tt

c)

tt

d)

tT

43.

Tall plant height is dominant over short plant height. Which of the following is NOT a possible genotype?

a)

homozygous tall

b)

homozygous short

c)

heterozygous tall

d)

heterozygous short

44.

True or false: an organism with a recessive trait could have either a heterozygous or homozygous genotype.

a)

True

b)

False

45.

________ is how a trait appears, or is expressed. The part we can see.

a)

Alleles

b)

Genotype

c)

Phenotype

d)

Genes

46.
An allele that is masked when a dominant allele is present. The "weaker" gene. 
a)
Dominant Allele
b)
Recessive Allele
47.
An allele whose trait always shows up in the organism when the allele is present. The "stronger" gene. 
a)
Dominant Allele
b)
Recessive Allele
48.

An organism’s genetic makeup or allele combination.

Cannot be seen. It is the code inside

a)

Genotype

b)

Phenotype

c)

Beanotype

d)

Notype

49.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
50.

B = brown fur b = white fur

In the Punnett square, what are the genotypes

a)

Bb, bb

b)

Brown, white

c)

1:1

51.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
52.
Which of the following is a phenotype?
a)
Aa
b)
black hair
c)
heterozygous genes
d)
mutated DNA
53.

Which of the following is a genotype?

a)

Aa

b)

black hair

c)

heterozygous genes

d)

mutated DNA

54.
Both parents in this Punnet square
a)
are homozygous dominant
b)
are homozygous recessive
c)
are heterozygous
d)
have blue eyes
55.
How many boxes would say BB?
a)
1
b)
2
c)
4
d)
0
56.

What is the genotypic ratio here

a)

TT = 1, Tt= 2, tt=1

b)

all tall

c)

TT= 3 tt = 1

d)

Tt = 1

57.

To be a yellow seed, genotype must be

a)

aa

b)

Aa

c)

AA

d)

AA or Aa

58.
A Punnet Square will 
a)
tell you exactly what your offspring will look like
b)
increase the chance you pass on recessive traits
c)
predict genotypes and phenotypes in offspring
d)
have no purpose but for Taylor to give us extra assignments
59.

The Phenotypic ratio here is

a)

25% blue eye 75 % brown eye

b)

BB = 25% Bb = 50% bb = 25%

c)

BB= 50 % bb = 50%

d)

All brown eye

60.

In the punnett square shown, what is the genotypes of the father/mother

a)

RW and RR

b)

RW and WW

c)

RR and WW

d)

RW and RR

61.

Where are genes located

a)

chromosoms

b)

parents

c)

alleles

d)

nucleus

62.

B = brown fur b = white fur

In the Punnett square, what is the genotypic ratio

a)

Bb, bb

b)

Brown, white

c)

1:1

63.

Tall, Short

a)

Punnett Square

b)

Pedigrees

c)

Genotypes

d)

Phenotypes

64.

Gg, GG

a)

Punnett Square

b)

Pedigrees

c)

Genotypes

d)

Phenotypes

65.

A pea plant that is Yy for certain trait.... Yy is considered its....

a)

Genotype

b)

Phenotype

66.

A pea plant that is green..... Being ´green´ is considered its...

a)

Genotype

b)

Phenotype

67.

The two alleles that determine the physical appearance of a specific trait

a)

Genotype

b)

Phenotype

68.

A section of your DNA that code for a specific trait

a)

Chromosome

b)

Gene

c)

Allele

69.

Different forms of a gene

a)

Chromosomes

b)

Alleles

70.

What is the genotype Rr?

a)

Homozygous Dominant

b)

Homozygous Recessive

c)

Heterozygous

71.

What is the genotype ww?

a)

Homozygous Recessive

b)

Heterozygous

c)

Homozygous Dominant

72.

What is the genotype Bb?

a)

Heterozygous

b)

Homozygous Dominant

c)

Homozygous Recessive

73.

What is the genotype FF?

a)

Homozygous Recessive

b)

Homozygous Dominant

c)

Heterozygous

74.
Dominant or recessive?
tt
a)
Dominant 
b)
Recessive
75.
Dominant or recessive?
Dd
a)
Dominant
b)
recessive
c)
neither
d)
homozygous
76.
What are the possible combinations of a pea plant with the alleles PP and a male pea plant with the alleles pp.
P= purple
p= white
a)
all Pp
b)
all PP
c)
Pp,PP,Pp,PP
d)
all pp
77.
When the allele combination is a dominate and a recessive trait together which trait will be seen?
a)
Dominate
b)
Recessive
c)
none
d)
both
78.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
79.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
80.
Homozygous or heterozygous?
BB
a)
Homozygous
b)
Heterozygous
81.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
82.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
83.
Georgette wants to breed her pet phoenixes, but she isn't sure if the babies will burst into blue flames or red flames. Her documents show that her female phoenix is homozygous dominant for red flames, while her male phoenix is homozygous recessive for blue flames. What color flames will the babies have?
a)
Red
b)
Blue
c)
Purple
d)
50% Red, 50% Blue
84.
What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?
a)
0%
b)
25%
c)
50%
d)
75%
85.
Leonardo bet his friend Olivet that two heterozygous green-eyed sea monsters could not have a recessive blue-eyed baby sea monster. Olivet said they can have a blue-eyed sea monster.
Who wins the bet?
a)
Leonardo
b)
Olivet
c)
Both
d)
Neither
86.
Jabba the Hutt has finally decided to settle down and have a family. He has undergone genetic testing and learned that he is heterozygous for Hutt Fungal Syndrome, which is caused by recessive alleles. He is worried that his children might suffer from this syndrome. His Hutt mate has undergone genetic testing and discovered she is homozygous dominant for the syndrome. Should Jabba be worried?
a)
Yes
b)
No
87.
A Jawa notices that his beloved pet desert rat, who has brown fur, just had several rat babies, some of which had white fur and some which had brown fur. Brown fur is the dominant trait. This means his rat must have what genotype?
a)
Homozygous Dominant
b)
Heterozygous
c)
Homozygous Recessive
88.

DNA is an acronym for _____

a)

Diphosphorus Nucleic Acid

b)

Ribose Nucleic Acid

c)

Deoxyribonucleic Acid

d)

Deoxyribonucleic Acetate

89.

A nucleotide is composed of

a)

A phosphate, sugar and nitrogenous base

b)

A protein, protein and Guanine

c)

A phosphate, Adenine, and nitrogenous base

d)

A protein, Adenine and nitrogenous base

90.

Which of the following is a base pair?

a)

Adenine - Cytosine

b)

Cytosine - Thymine

c)

Deoxyribose - Cytosine

d)

Cytosine - Guanine

91.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
92.
Which 2 molecules form the sides (backbone) of the DNA ladder?
a)
deoxyribose sugar and adenine
b)
deoxyribose sugar and a hydrogen bond
c)
deoxyribose sugar and the nucleus
d)
deoxyribose sugar and phosphate
93.
Cytosine always pairs with
a)
Adenine
b)
Thymine
c)
Uracil
d)
Guanine
94.
Nucleotides are made up of a sugar, phosphate, and..?
a)
nitrogenous base
b)
nucleic acid
c)
cholesterol
d)
fatty acid
95.
Adenine bonds with ______________.
a)
Guanine
b)
Thymine
c)
Cytosine
d)
Adenine
96.
What are the 4 nitrogen bases?
a)
adenine, thymine, cytoplasm, and guanine
b)
adenine, thymine cytosine, and guanine
c)
adenine, thymine, cytosine, and gylcerol
d)
adenine, thymine, cytosine, and glucose
97.
Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG
a)
ATG TGA CAG
b)
TAC ACT GTC
c)
GTA AGT GAC
d)
CAT TCA CTG
98.
Which sequence of DNA bases would pair with this partial strand
CAT TCA CTG
a)
ATG TGA CAG
b)
TAC ACT GTC
c)
GTA AGT GAC
d)
CAT TCA CTG
99.

What is the definition of the phenotype?

a)

The physical traits of an organism

b)

The genetic makeup of an organism

c)

The letters eg, Aa

d)

How the genotype is expressed.

100.

Which answer includes the dominant homozygous genotype?

a)

AA

b)

Aa

c)

aa

101.

Which answer contains the heterozygous genotype?

a)

AA

b)

aa

c)

Aa

102.

What is the definition of an allele?

a)

An allele is a variety of a gene.

b)

An allele is the genetic makeup of an organism

c)

An allele is another word for a gene.

103.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
104.
What is the definition of Homozygous?
a)
When one allele is dominant and one is recessive
b)
When an individual has two sets of the same allele.
c)
when it is neither dominant or recessive
105.

A gene is...

a)

A heritable factor that controls a specific characteristic

b)

An allele

c)

A length of DNA which occupies a specific position on the chromosome

106.

What is the definition of a genotype?

a)

The genetic makeup of an organism

b)

The physical traits of an organism.

c)

When one allele is dominant and one allele is recessive.

d)

When both alleles are dominant.

107.

What is the definition of heterozygous?

a)

When both alleles are dominant

b)

When one allele is dominant and one is recessive.

c)

When both alleles are recessive.

d)

When one gene is dominant and one is recessive.

108.

The genotype AA is...

a)

homozygous

b)

heterozygous

109.

The genotype Dd is...

a)

homozygous

b)

heterozygous

110.

Chromosomes are only inherited from one parent.

a)

True

b)

False

111.

If brown (B) is dominant and red (b) is recessive for hair color. What is the phenotype of (Bb)?

a)

brown hair

b)

red hair

112.

The phenotype are the physical traits that are expressed in an organism.

a)

True

b)

False

113.

If tall (T) is dominant to short (t), what is the phenotype of plant that is (tt)?

a)

Tall

b)

Short

114.

If long whiskers (w) are recessive to short whiskers (W), what is the phenotype of a cat with the genotype (Ww)?

a)

Long whiskers

b)

Short whiskers

115.

The passing of traits from parents to offspring is called....

a)

Luck

b)

Heredity

c)

Allele

d)

Gene

116.

If no freckles (F) is dominant and having freckles (f) is recessive. What is the genotype of a person who is heterozygous for that trait?

a)

FF

b)

Ff

c)

ff

117.

If purple (P) flowers are dominant to white (p) flowers. What is the genotype of a flower that is homozygous recessive

?

a)

PP

b)

Pp

c)

pp

118.

If smooth (S) is dominant in seeds and wrinkled (s) is recessive. What is the genotype of a seed that is homozygous dominant?

a)

SS

b)

Ss

c)

ss

119.
Where is all the genetic information in a cell?
a)
Nucleus
b)
Nucleotides
c)
Chromosomes
d)
Cytoplasm
120.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
121.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
122.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
123.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
124.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
125.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
a)
50 % Brown Hair and 50% Blond Hair 
b)
25 % Brown Hair and 75% Blond Hair 
c)
75 % Brown Hair and 25% Blond Hair 
d)
0% Brown Hair and 100% Blond Hair 
126.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
127.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
128.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
129.
What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
130.
Which shows the correct complementary base pairing for DNA?
a)
C-A, T-G
b)
A-G, C-T
c)
C-G, U-A
d)
T-A, G-C
131.
The drawing shows the structure of what molecule?
a)
A DNA molecule
b)
A lipid molecule
c)
A carbohydrate molecule
d)
A protein molecule
132.
If a DNA molecule consists of 29% Guanine, how much cytosine will it contain?
a)
29%
b)
58%
c)
21%
d)
I have no idea.

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