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Genetics Review_CambSciFY24

Total questions: 60

Worksheet time: 2hrs 35mins

Name
Class
Date
1.
In the Punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
2.
B = brown fur  b = white fur
In the Punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
3.
What are the possible genotypes for this cross?
(Click the picture to see it without the text)
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
4.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
5.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
6.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
7.

If the dominant trait is having freckles (F) and the recessive trait is no freckles (f), which allele combination(s) below would represent a person who has freckles? (select all that apply)

a)

FF

b)

Ff

c)

ff

8.
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 
9.

The combination of genes a person has, represented by letters, is their...

a)

Genotype

b)

Phenotype

c)

Chromosome

d)

Punnett Square

10.

What belongs in the last box?

a)

RR

b)

Rr

c)

rr

d)

ff

11.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
12.

What belongs in Box 4?

a)

Y

b)

YY

c)

Yy

d)

yy

13.

Look at the punnett square. What is the probability that the offspring would have homozygous alleles for the trait?

a)

100%

b)

75%

c)

50%

d)

25%

e)

0%

14.
Both parents in this Punnet square
a)
are homozygous dominant
b)
are homozygous recessive
c)
are heterozygous
d)
have blue eyes
15.

What is the probability & 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

16.

Which of the following allele pairs is heterozygous?

a)

RR

b)

Qq

c)

ss

17.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
18.
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
19.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
20.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
21.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
22.
Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.
a)
DNA
b)
protein
c)
RNA
d)
glucose nucleic acid (GNA)
23.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
24.

What belongs in box 5?

a)

F

b)

FF

c)

Ff

d)

ff

25.

What belongs in box 8?

a)

F

b)

FF

c)

Ff

d)

ff

26.

What belongs in box 4?

a)

F

b)

FF

c)

Ff

d)

ff

27.
What do we use pedigrees for?
a)
To look at families
b)
To make determinations about the offspring
c)
To track traits in families
d)
Nothing
28.

In a pedigree, squares represent _______

a)

males

b)

females

29.

In a pedigree, circles represent _____

a)

males

b)

females

30.

How many females are in this pedigree?

a)

3

b)

4

c)

6

d)

7

31.

The oldest generation in a pedigree is located _______.

a)

at the top.

b)

at the bottom.

c)

in the middle.

32.

The youngest generation in a pedigree is located _______.

a)

at the top.

b)

at the bottom.

c)

in the middle.

33.

How many daughters does are represents in this pedigree?

a)

0

b)

1

c)

2

d)

3

34.

How many males are in this pedigree?

a)

3

b)

4

c)

6

d)

7

35.

How many alleles does a person carry for a trait?

a)

1

b)

2

c)

3

d)

4

36.

How many alleles does a child get from each parent for a trait?

a)

1

b)

2

c)

3

d)

4

37.

On a pedigree, this symbol represents a ----

a)

not affected male.

b)

not affected female.

c)

affected male.

d)

affected female.

38.

How many individuals are there in the 3rd generation?

a)

1

b)

2

c)

4

d)

6

39.

In the second generation of this pedigree, how many people are carriers of the trait? *Remember: a carrier does not have the disorder/disease, but can pass it on to his/her children.

a)

1

b)

2

c)

3

d)

5

40.

Which individual in the first generation is a carrier?

a)

I-1

b)

I-2

41.

Assuming a trait is AUTOSOMAL DOMINANT, what genotype would make a person UNAFFECTED?

a)

AA

b)

Aa

c)

aa

d)

XAY

e)

XaY

42.

Assuming a trait is AUTOSOMAL RECESSIVE, what genotype would make a person AFFECTED?

a)

AA

b)

Aa

c)

aa

d)

XAY

e)

XaY

43.

Which of the following genotypes shows a CARRIER for a trait?

a)

XBXb

b)

XbXb

c)

XBXB

d)

XbY

44.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

XN YN

b)

Xn Yn

c)

XN Y

d)

Xn Y

45.

What is 1 examples of an X-linked genetic disorder?

a)

Huntington's Disease

b)

Down's Syndrome

c)

Colorblindness

d)

Diabetes

46.
Different variations of a gene are called?
a)
Alleles
b)
DNA
c)
Chromosome
d)
Gene
47.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
48.

Colorblindness is more common in males than in females because......

a)

fathers pass the allele for colorblindness to their sons only

b)

the allele for colorblindness is located on the Y chromosome

c)

the allele for colorblindness is recessive and located on the X chromosome

d)

males who are colorblind have two copies of the allele for colorblindness

49.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

XN YN

b)

Xn Yn

c)

XN Y

d)

Xn Y

50.

What would the genotype be of a colorblind male?

a)

XNY

b)

XNYn

c)

XnY

d)

XnYn

51.

The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?

a)

0%

b)

25%

c)

50%

d)

100%

52.

Colorblindness is a sex-linked recessive trait. A colorblind woman marries a male with normal color vision. What is the percent chance of them having a color blind son?

a)

0%

b)

25%

c)

50%

d)

75%

53.
What is the genotype of the mother?
a)
BB
b)
bb
c)
Bb
d)
BB or Bb
54.
This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?
a)

8

b)

5

c)

2

d)

3

55.
What do half colored symbols represent?
a)
The individual is a carrier (heterozygous).
b)
The individual expresses the trait.
c)
The individual has both recessive alleles.
d)
The individual has both dominant alleles.
56.

Which best explains why males cannot be carriers of X-linked traits?

a)

Males only have one X chromosome

b)

Males have two copies of the X chromosome

c)

Males can be heterozygous for a particular trait

d)

Males do not have an X chromosome

57.

How many chromosomes do humans typically have?

a)

46

b)

45

c)

47

d)

23

58.

Chromosome pair 23 is called _____.

a)

sex chromosomes

b)

autosomal chromosomes

59.

What are the female sex chromosomes?

a)

XX

b)

XY

c)

YY

d)

XZ

60.

What are the male sex chromosomes?

a)

XX

b)

XY

c)

YY

d)

XZ

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