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Mendelian Genetics Practice: Mendel's Laws & Two-Factor Crosses

Total questions: 25

Worksheet time: 1hrs 2mins

Name
Class
Date
1.

What genotype is missing from this Punnett Square?

a)

RrYy

b)

RRYY

c)

rryy

d)

RrYY

2.

Based off this Punnett square, what fraction of the offspring will have wrinkled, yellow seeds?

a)

9/16

b)

3/16

c)

1/16

d)

16/16

3.

A male beetle has the genotype Aarr. If this beetle mates with a female with genotype AARr, what is the chance their offspring will have the genotype AaRr?

a)

3/16

b)

4/16 (which reduces to 1/4)

c)

8/16 (which reduces to 1/2)

d)

12/16 (which reduces to 3/4)

4.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
5.

Aa, DD, Bb, yy are all examples of

a)

genotypes

b)

phenotypes

6.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
7.
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%
8.

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be best represented by which genotypes?

a)

BBEE x bbee

b)

BBEe x BbEe

c)

BbEE x BbEe

d)

BBee x BBEE

9.

What goes in box 3?

a)

Aabb

b)

AABB

c)

AAbb

d)

aaBb

10.
What gamete possibilities could come from this parent's genotype?
a)
AB, AB, aB, aB
b)
Ab, AB, Ab, ab
c)
Ab, Ab, Ab, Ab
d)
AB, aB, ab, aB
11.

Which of the following identifies the phenotypes?

a)

A

b)

B

c)

C

d)

D

12.

Which of the following identifies the gametes?

a)

A

b)

B

c)

C

d)

D

13.

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds?

a)

RrYy

b)

RRyy

c)

RRYy

d)

rryy

14.

Select BOTH of the following option(s) that is/are considered to be homozygous.

a)

BB

b)

Bb

c)

bb

15.

What does it mean for a trait to be considered "dominant"

a)

The dominant trait is expressed with just one allele present

b)

The dominant trait is expressed only when two alleles are present

c)

A dominant trait is when the both alleles are the same

d)

A dominant trait is when the both alleles are different

16.

Select all of the following options that represent a genotype.

a)

Rr

b)

Round peas

c)

Smooth peas

d)

rr

17.

Select all of the following options that represent a phenotype.

a)

Rr

b)

Round peas

c)

Smooth peas

d)

rr

18.

Which of these terms is associated with gametes? (Select all that apply.)

a)

Haploid

b)

Diploid

c)

Egg cell

d)

Skin cell

e)

Sperm cell

19.

In a cross of purple flowered heterozygous plants (Pp), the letter P represents the allele for purple flowers and the letter p represents the allele for white flowers. What is the probability that an offspring of this cross expresses plants with purple flower phenotypes?

a)

0

b)

1/4

c)

1/2

d)

3/4

20.

If your genotype is Bb, then you can only pass a B or b to your child but you can't pass both. Which of Mendel's laws does this correspond to?

a)

Law of Dominance

b)

Law of Segregation

c)

Law of Independent Assortment

21.

An organism is a hybrid genotype (Tt) but is appears tall instead of short. This corresponds to which of Mendel's laws?

a)

Law of Dominance

b)

Law of Segregation

c)

Law of Independent Assortment

22.

Which of Mendel's laws states that alleles are distributed to gametes independent of one another?

a)

Law of Dominance

b)

Law of Segregation

c)

Law of Independent Assortment

23.

The Law of Segregation applies to mitosis but not meiosis.

a)

True

b)

False

24.

Which of Mendel's Laws says that every individual has two alleles of each gene and when gametes are produced, each gamete receives one of these alleles?

a)

Law of Segregation

b)

Law of Independent Assortment

c)

Law of Dominance

d)

Genetics Law

25.

An organism is ______ for a trait if its two alleles for the trait differ from each other

a)

heterozygous

b)

homozygous

c)

hybrid

d)

dominant