Free Printable Genetic Test Practice

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.

In a heterozygous genotype, the ___________ allele is represented in the phenotype.

a)

recessive

b)

dominant

c)

lower case letter

d)

both

4.

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

a)

tt

b)

Tt

c)

Bb

d)

TT

5.

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%

6.

In the punnett square shown, what must the genotype of the missing parent be?

a)

BB

b)

Bb

c)

bb

d)

Tt

7.

Which of the following is a phenotype?

a)

Aa

b)

black hair

c)

heterozygous genes

d)

mutated DNA

8.

What is a dominant allele?

a)

A trait that is always shown (capital letter)

b)

A trait that can be hidden (lower case letter)

c)

Alleles that are the same

d)

Alleles that are different

9.

What genotype is missing from this Punnett Square?

a)

RrYy

b)

RRYY

c)

rryy

d)

RrYY

10.

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%

11.

What does heterozygous mean?

a)

An organism that has the same genes for a trait (TT or tt)

b)

An organism that has different genes for a trait (Tt)

c)

When neither gene is fully dominant; offspring is a mixture of both

d)

the different forms of a trait (hair color--> brown, blonde, red

12.

Which of the following genotypes is heterozygous?

a)

Bb

b)

BB

c)

bb

d)

B

13.

An allele that is masked when a dominant allele is present. The "weaker" gene.

a)

Dominant Allele

b)

Recessive Allele

14.

An organism’s genetic makeup or allele combination.

a)

Genotype

b)

Phenotype

c)

Beanotype

d)

Notype

15.

An organism’s physical appearance, or visible traits.

a)

Genotype

b)

Phenotype

c)

Beanotype

d)

Notype

16.

What is called when a organism has two different alleles for a trait. Tt or Rr

a)

Heterozygous

b)

Homozygous

c)

Domozygous

d)

Thermozygous

17.

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%

18.

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%

19.

What is the phenotypic ratio in this cross?

Brown is dominant to blonde.

a)

2:2 Brown to Blonde

b)

3:1 Brown to Blonde

c)

4:0 Brown to Blonde

d)

3:1 Blonde to Brown

20.

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

21.

What is the GENOTYPIC ratio if two heterozygous brown eyed parents were to cross?

a)

2:2:1

b)

3:1

c)

1:2:1

d)

2:2

22.

What is the PHENOTYPIC ratio if a heterozygous brown eyed parent crossed with a blued eyed parent?

a)

2:2

b)

3:1

c)

4:0

d)

1:2:1

23.

Aa, DD, bB, yy are all examples of

a)

genotypes

b)

phenotypes

24.

What is the dominant trait?

a)

yellow pea seeds

b)

green pea seeds

c)

there is no dominant seed

d)

Jolly green giant

25.

How are individuals III-2 and II-4 related?

a)

Cousins

b)

Dad and Daughter

c)

Uncle and Niece

d)

Grandpa and Granddaughter

26.

What type of heredity is shown in the pedigree?
(hint: check your notes - "modes of inheritance")

a)

Sex-Linked Dominant

b)

Sex-Linked Recessive

c)

Autosomal Dominant

d)

Autosomal Recessive

27.

In a pedigree, what shape represents a male?

a)

circle

b)

square

c)

triangle

d)

diamond

28.

How many generations are shown in this pedigree?

a)

1

b)

2

c)

3

d)

4

29.

There are no carriers for Huntington's Disease- you either have it or you don't. Is Huntington's disease caused by a dominant or recessive trait?

a)

Dominant

b)

Recessive

30.

Huntington's Disease is a dominant trait.
What is the correct genotype for individual I-2?

a)

HH

b)

Hh

c)

hh

d)

H_

31.

How many kids did the mother and father from the first generation have?

a)

2

b)

4

c)

5

d)

6

32.

Which individual in the first generation is a carrier?

a)

The male

b)

The female

c)

individual 1

d)

None of the above

33.

Is this trait (the shaded individuals) dominant or recessive?

a)

dominant

b)

recessive

34.

What kind of trait is colorblindness if females can be carriers without having the disease?

a)

Regular trait

b)

Sex-linked trait

c)

Co-dominant trait

d)

Incomplete dominant trait

35.

If hemophilia is a sex-linked recessive trait, what genotype would individual III-3 have?

a)

X^bX

b)

X^bX^b

c)

X^bY^b

d)

X^bY

36.

What is the mode of inheritance shown here?

a)

Autosomal Dominant

b)

Autosomal Recessive

c)

Sex Linked Recessive

d)

Co-dominant

37.

In Labradors, coat color is an epistatic trait. Black (B) is dominant to chocolate (b). However, if the dog is homozygous recessive (ee) in the epistatic genotype, the dog will be yellow. From the following cross, how many yellow dogs would be likely?

a)

12

b)

8

c)

4

d)

2

38.

In Labradors, coat color is an epistatic trait. Black (B) is dominant to chocolate (b). However, if the dog is homozygous recessive (ee) in the epistatic genotype, the dog will be yellow. From the following cross, how many chocolate dogs would be likely?

a)

12

b)

8

c)

4

d)

3

39.

Snapdragons are a flower that get their color from genes that represent incomplete dominance. Red (R) is dominant to White (r). But the heterozygous flowers are pink. What is the phenotypic ratio of a cross between two pink snapdragons?

a)

3:1

b)

1:2:1

c)

2:2

d)

1:1:1:1

40.

What were the parent's genotypes for this cross?

a)

AB and oo

b)

Ao and Bo

c)

AA and BB

d)

AB and Ao

41.

This is a cross of two parents for two traits. Since both parents are heterozygous for both traits, what will the phenotypic ratio be?

a)

4:4:4:4

b)

6:6:2:2

c)

9:3:3:1

d)

8:8

42.

What does the term phenotype mean?

a)

the observable characteristic of an individual

b)

the allele combination of an individual

c)

how an organism looks

d)

when one allele in a gene is dominant and one allele is recessive

43.

In Pedigrees, what does an open circle represent?

a)

Not Affected Male

b)

Not Affected Female

c)

Affected Male

d)

Affected Female

44.

Give the genotype for person II-1, for this autosomal trait.

a)

GG

b)

Gg

c)

gg

d)

we cannot be 100% sure of the genotype

45.

Match the following

a)

Homozygous Dominant

1.

BB

b)

Heterozygous

2.

Bb

c)

Homozygous Recessive

3.

bb

Genetic Test Practice

Total questions: 45

Worksheet time: 1hrs 13mins

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