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Genetics Review

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.

an organism’s genetic makeup or allele combinations (ex: BB, Bb, or bb).

a)

Genotype

b)

Allele

c)

DNA

d)

Phenotype

2.

the different forms of a gene.

a)

Recessive Trait

b)

DNA

c)

Dominant Trait

d)

allele

3.

a trait that is always expressed in the phenotype of an organism.

a)

Phenotype

b)

Dominant Trait

c)

Gene

d)

Recessive Trait

4.

a trait that is expressed only when two alleles are present.

a)

Recessive Trait

b)

Dominant Trait

c)

Genes

d)

Rr

5.
The genotype of an organism describes the
a)
codons that make up the genes
b)
number of gene's on the chromosmes
c)
genetic make-up of a trait
d)
type of chromosomes in the nucleus
6.

What is a phenotype?

a)

An observable characteristic

b)

The combination of alleles

c)

The sister chromatids

d)

The location of a gene on a chromosome

7.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
8.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
9.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
10.
Look at the picture. The probability that a child will inherit the recessive trait is
a)
25%
b)
50%
c)
75%
d)
100%
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.

An example of a heterozygous gene is

a)

FF

b)

ff

c)

Ff

13.

An example of a homozygous recessive gene is

a)

Dd

b)

DD

c)

dd

d)

DAB

14.

An example of a homozygous dominant gene is

a)

Dd

b)

DD

c)

dd

d)

DAB

15.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
16.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
17.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's genotype?
a)
BB
b)
bb
c)
Bb
d)
bB
18.

Punnett Square

a)

a genetic factor that blocks another genetic factor

b)

a genetic factor that is blocked by the presence of a dominant factor

c)

physical appearance of a trait

d)

a model used to predict possible genotypes and phenotypes of offspring

19.
Hair colour is an example of
a)
genotype
b)
phenotype
20.

There are two cats that breed together. One parent is homozygous dominant and has a long tail. What percentage of the offspring have long tails?

a)

25%

b)

50%

c)

75%

d)

100%

21.

If red flower color is the dominant allele (R), then what would the genotype of this rose plant be?

a)

homozygous dominant

b)

heterozygous

c)

homozygous recessive

22.

Pea plants have two alleles for height: (T) for tall and (t) for short. What would the phenotype be for a pea plant that is heterozygous for the height gene?

a)

Tall

b)

Short

23.

Dominant (A) red apples

Recessive (a) yellow apples

What percentage of the offspring will be red?

a)

25%

b)

50%

c)

75%

d)

100%

24.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
25.
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 purple?
a)
25%
b)
0%
c)
100%
d)
50%
26.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
27.
AA and Aa always show up as
a)
dominant
b)
recessive
28.

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, the offspring in box 4 would:

a)

be white.

b)

be heterozygous.

c)

be gray.

d)

be homozygous.

29.

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, how many offspring would be black?

a)

0

b)

1

c)

2

d)

3

e)

4

30.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
31.

Which of the following is/are considered to be purebreds? Select all that apply.

a)

AA

b)

bb

c)

Dd

d)

ee

32.

In pea plants, tall is dominant to short. If 2 heterozygous plants are crossed, what % of the offspring will be short?

a)

0%

b)

25%

c)

50%

d)

75%

33.
Black fur is dominant (B) over white fur (b).  Find the probability of heterozygous offspring using the following genotype of these parents.
Bb + bb
a)
0%
b)
25%
c)
50%
d)
100%
34.
What is the allele combination for square 1?
a)
Dd
b)
DD
c)
dd
d)
D
35.
What is the possibility of this offspring having a dominate trait?
a)
50%
b)
75%
c)
25%
d)
0%
36.

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

a)

recessive

b)

dominant

c)

both

37.

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

38.

Which of the following genotypes is homozygous dominant?

a)

aa

b)

Aa

c)

AA

39.

What is the probability that the offspring will have blue eyes?

a)

25%

b)

50%

c)

75%

d)

100%

40.

Dominant alleles are represented by a:

a)

capital letter

b)

lowercase letter

41.

Phenotype or Genotype? HH

a)

Phenotype

b)

Genotype

42.

What are the alleles for this parent?

(a)  

43.

What is the missing allele for this parent?

(a)  

44.

What are the alleles of highlighted box?

(a)  

45.

What are the alleles of highlighted box?

(a)  

46.

What are the alleles of highlighted box?

(a)  

47.

What are the alleles of highlighted box?

(a)  

48.

What are the alleles of highlighted box?

(a)  

49.

What are the alleles of highlighted box?

(a)  

50.

What are the alleles of highlighted box?

(a)  

51.

What are the alleles of highlighted box?

(a)  

52.
A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). 
a)
100 % tan
b)
100 % brown 
c)
50 % brown and 50% tan 
d)
75 % brown and 25 % tan 
53.

Which of the following allele pairs is heterozygous?

a)

RR

b)

Qq

c)

ss

54.
Both parents in this Punnet square
a)
are homozygous dominant
b)
are homozygous recessive
c)
are heterozygous
d)
have blue eyes
55.

What belongs in the last box?

a)

RR

b)

Rr

c)

rr

d)

ff

56.

PP

a)

Homozygous Dominant

b)

Heterozygous

c)

Homozygous Recessive

57.

Hh

a)

Homozygous Dominant

b)

Homozygous Recessive

c)

Heterozygous

58.

Two alleles can be the same

a)

homozygous

b)

heterozygous

59.

Two alleles can be different

a)

homozygous

b)

heterozygous

60.

Which of the following is a genotype?

a)

Gh

b)

GG

c)

GH

d)

Y

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