Free Printable Genetics Review

1.

Homozygous is when...

a)

the alleles are the same

b)

the alleles are different

c)

the alleles are absent

d)

the alleles are present

2.

Heterozygous is when...

a)

the alleles are the same

b)

the alleles are different

c)

the alleles are absent

d)

the alleles are present

3.

T - tall and t = short
In the punnett square below, what belongs in the missing square

a)

tt

b)

Tt

c)

Bb

d)

TT

4.

What genotype is missing from this Punnett Square?

a)

RrYy

b)

RRYY

c)

rryy

d)

RrYY

5.

Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?

a)

0%

b)

25%

c)

50%

d)

100%

6.

Coat color in mice is incompletely dominant. Yellow (YY) and white-colored (WW) mice are homozygous, while cream-colored mice are heterozygous. If two cream-colored mice mate, what phenotypic ratio can we expect of their offspring? (Y= yellow coat allele, W= white coat allele)

a)

2 YY: 2 WW

b)

1 YY: 2 YW: 1 WW

c)

1 YY: 3 WW

d)

2 YY: 1 YW: 1 WW

7.

Coat color in mice is incompletely dominant. Yellow (YY) and white-colored (WW) mice are homozygous, while cream-colored mice are heterozygous. If two cream-colored mice mate, what phenotypic ratio can we expect of their offspring? (Y= yellow coat allele, W= white coat allele)

a)

2 YY: 2 WW

b)

1 YY: 2 YW: 1 WW

c)

1 YY: 3 WW

d)

2 YY: 1 YW: 1 WW

8.

In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W). The heterozygous genotype is expressed as pink.

Match the genotype with phenotype

a)

RR

1.

Red flowers

b)

WW

2.

White flowers

c)

RW

3.

Pink flowers

9.

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted).

Two erminette chickens (BW) were crossed. What percent of their offspring would have black feathers?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

10.

Colorblindness is a recessive X-linked disorder.

Which genotype represents a male with normal vision?

a)

X^NY^N

b)

XⁿYⁿ

c)

X^NY

d)

XⁿY

11.

Which of the following genotypes belongs in the red box in the Punnett square?

a)

X^BX^b

b)

X^bX^b

c)

X^bY

d)

X^BY

12.

What would the genotype be of a colorblind male?

a)

X^NY

b)

X^NYⁿ

c)

XⁿY

d)

XⁿYⁿ

13.

In a pedigree, which shape represents a male?

a)

circle

b)

square

14.

The trait this pedigree traces is recessive because it skips a generation and individuals can be carriers. What is the most likely genotype for person III-3?

a)

GG

b)

Gg

c)

gg

15.

If this pedigree shows an autosomal recessive disorder, what MUST the genotype of individual II-3 be?

a)

HH

b)

Hh

c)

hh

d)

None of the above

16.

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

17.

Does this pedigree show a dominant or recessive trait?

a)

Dominant

b)

Recessive

18.

What is the genotype of the mother?

a)

BB

b)

bb

c)

Bb

d)

BB or Bb

19.

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

20.

Which of the following is a phenotype?

a)

BB

b)

Bb

c)

bb

d)

Blue eyes

21.

having two different genes for a trait (sometimes called hybrid).

a)

protein

b)

homozygous

c)

heterozygous

d)

genotype

22.

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

Genetics Review

Total questions: 22

Worksheet time: 22mins

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