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Year 10 A Biology Unit 1 Revision

Total questions: 60

Worksheet time: 1hrs 6mins

Name
Class
Date
1.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
2.
The man who studied genetics and came up with genetics is
a)
Watson
b)
Crick
c)
Mendel
d)
Darwin
3.
A homozygous dominant dog with brown fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?
a)
100% BB
b)
75% BB and 25%Bb
c)
50 % BB and 50% Bb
d)
50% Bb and 50% bb
4.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
5.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
6.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
7.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
8.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
9.
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
10.
Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?
a)
50% tall and 50% short
b)
75%tall and 25% short
c)
100%short
11.
What is the basic unit of DNA?
a)
amino acid
b)
protein
c)
nucleotide
d)
sugar
12.

If a portion of one side of a DNA molecule has the base sequence GATCAC. What is the sequence of bases on the complementary side?

a)

GATCAC

b)

CUAGUG

c)

CTACAC

d)

CTAGTG

13.

How many bases encode one amino acid?

a)

1

b)

2

c)

3

d)

4

14.
If 15% of a DNA sample is cytosine, C, what percentage is guanine, G?
a)
15%
b)
35%
c)
70%
d)
85%
15.
B=brown eyes
b= blue eyes
What is true about 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
16.
One form of a gene is called_______________
a)
a DNA
b)
a Phenotype
c)
a trait
d)
an allele
17.
What is the definition of genotype?
a)
The physical expression of a trait
b)
The genetic combination of alleles 
c)
the genes on a DNA strand
18.
What is the definition of phenotype?
a)
The physical expression of a trait
b)
The genetic combination of alleles
c)
A gene on the DNA strand
19.

If 15% of a DNA sample is cytosine, C, what percentage is Thymine, T?

a)

15%

b)

35%

c)

70%

d)

85%

20.
What does a filled in square represent?
a)
Not affected Female
b)
Not affected Male
c)
Affected Male
d)
Affected Female
21.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
22.
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
23.
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.
24.
What does an open circle represent?
a)
Not Affected Male
b)
Not Affected Female
c)
Affected Male
d)
Affected Female
25.
Is this trait (the shaded individuals) dominant or recessive?
a)
dominant
b)
recessive
26.
In the second generation-how many people are carriers of the trait?
a)
2
b)
3
c)
5
d)
6
27.
How many people in this whole pedigree have the trait/disease?
a)
2
b)
3
c)
4
d)
6
28.
How many females are in this pedigree?
a)
3
b)
4
c)
6
d)
7
29.
Which gender can be carriers of colorblindness and not have it?
a)
Just males
b)
Just females
c)
Both genders
30.
Why do all the daughters in Generation II carry the colorblind gene?
a)
Because mom passed on the gene.
b)
Because dad passed on the X chromosome.
c)
Because their brother has it.
d)
Because their brother gave it to them.
31.
Give the genotype for person II-1
a)
GG
b)
Gg
c)
gg
32.
If this pedigree shows a recessive disorder, what MUST the genotype of individual II-3 be?
a)
HH
b)
Hh
c)
hh
d)
None of the above
33.

What is the mode of inheritance shown here?

a)

Recessive

b)

Sex Linked

c)

Dominant

d)

Not enough information to be sure

34.

What is this?

a)

A karyotype

b)

A pedigree

c)

A chromatotype

d)

A Punnett Square

35.

Why does individual IV-7 have colorblindness?

a)

Because his mum is a carrier.

b)

Because his dad has it.

c)

Because his siblings have it.

d)

Because his uncle has it.

36.

This is an example of ___________.

a)

What happens when mad scientists are allowed to perform unethical experiments in genetics.

b)

Codominance

c)

Dominant and recessive characteristics

d)

Sex linked characteristics

37.
This is an example of ___________.
a)
Incomplete Dominance
b)
Codominance
38.

If you cross a black chicken with a white chicken, only checkered chickens would be produced. What would you expect if two checkered chickens were mated?

a)

100% checkered

b)

50% black, half White

c)

25% Checkered, 25% Black, 25% White, 25% Chess

d)

50% Checkered, 25% Black, 25% White

39.

What is the genotype of individual III-4?

a)

XcXc

b)

XcY

c)

XCY

d)

XcYc

40.

The pedigree below shows the inheritance of a disorder which must be:

a)

recessive

b)

dominant

c)

sex linked

d)

codominant

41.

The best evidence that this pedigree shows a sex linked recessive disorder is:

a)

There are less females affected than males.

b)

All the male children of female carriers inherited the disorder.

c)

Two unaffected parents have had affected children.

d)

Two affected parents have had unaffected children.

42.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
43.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
44.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
45.

What type of heredity do we know for sure given the information in the pedigree shown?

a)

Sex-Linked Dominant

b)

Sex-Linked Recessive

c)

Dominant

d)

Recessive

46.
What gender has an X and a Y chromosome?
a)
male
b)
female
c)
transgender 
d)
all of the above
47.

Which of the following colors does "Aa" indicate that the individual's pea pod will be?

a)

Yellow, because it has a little "a"

b)

Green, because it has a big "A"

c)

Green, because it has a little "A"

d)

Yellow, because it has a big "A"

48.

How many of the offspring of the 2 parent pea plants have a green pod color?

a)

1 out of 4

b)

2 out of 4

c)

3 out of 4

d)

4 out of 4

49.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
50.

The heredity of Haemophilia in the pedigree shown is known to be sex linked. What is the phenotype of the mother at generation II-2?

a)

XHXh

b)

XHXH

c)

XhXh

d)

XHY

51.
If two parents have type AB blood, what is the probability that their child will have type O blood?
a)
0%
b)
25%
c)
50%
d)
100%
52.
If one parent is heterozygous for type A blood and the other parent is homozygous for type B blood, what is the probability they could have a child with type B blood?
a)
0%
b)
25%
c)
50%
d)
100%
53.
What is the genotype of a person who is heterozygous for type B blood?
a)
IBIB
b)
IBi
c)
IAIB
d)
IAi
54.
A mom who has type A blood has a child who is type AB.  What is a possible blood type that the father could have?
a)
B 
b)
A 
c)
O
55.

If one of your parents is blood type A and the other is type B, which of the following blood types could you be?

a)

O

b)

AB

c)

A or B

d)

Any

56.
An individual's blood type is determined by
a)
environment
b)
genetics
c)
both environment and genetics
d)
your children's blood type
57.
If a father is AA and a mother is AB, what is the probability for a child with AB blood? 
a)
0%
b)
25%
c)
50%
d)
75%
58.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
59.
Which of the following units are repeatedly joined together to form a strand of DNA?
a)
amino acids
b)
nucleotides
c)
fatty acids
d)
polysaccharides
60.
In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of
a)
cytosine
b)
guanine
c)
thymine
d)
uracil

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