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Worksheets

Genetics

Total questions: 21

Worksheet time: 41mins

Name
Class
Date
1.

Which genotype is homozygous

a)

BbHh

b)

BBHh

c)

BBhh

d)

BbHH

2.

What is the phenotypic ratio of a cross between a heterozygous tall (Tt) and a short (tt) plant?

a)

3 tall plants and 1 short plant

b)

2 tall plants and 2 short plants

c)

4 tall plants

d)

1 tall plant and 3 short plants

3.

What is the name of this diagram?

a)

Chromotype

b)

Phenotype

c)

Gentoype

d)

Karyotype

4.

If a curly haired guinea pig (Hh) is crossed with another curly haired guinea pig (HH), what will the possible genotypes of the offspring be?

a)

HhHH

b)

Hh

c)

hh

d)

HH

5.

Based on the pedigree chart, what can we conclude?

a)

The disease is more common in females.

b)

The disease is recessive

c)

The disease is sex-linked

d)

The disease is expressed in every generation.

6.

A culture of cells is exposed to radiation. Afterwards, many of the cells appear different. What has probably occurred?

a)

mutation

b)

speciation

c)

bacterial infection

d)

contamination

7.

Black fur is dominant to white fur in bears. What genotypes would the parents have to be for the offspring to be all black? (more than one right answer).

a)

Bb x Bb

b)

BB x Bb

c)

BB x bb

d)

bb x bb

8.

Based on the pedigree, which statements shown are correct?

a)

Mom (Gen I) is homozygous recessive.

b)

Dad (Gen I) is homozygous dominant.

c)

Gen. 3 has 1 heterozygous male and one homozygous dominant male.

d)

Gen. 2 contains all heterozygous (carriers).

9.

In incomplete dominance, what is the outcome of a cross between 2 heterozygous (Rr) pink flowers?

a)

2 red, 2 white

b)

1 red, 2 pink, 1 white

c)

4 pink

d)

2 red, 1 pink, 1 white

10.

A genetic pedigree showing that only males are affected by a certain disorder is evidence of

a)

sex-linked inheritance

b)

passive inheritance

c)

dominant inheritance

d)

recessive inheritance

11.

Why does sexual reproduction result in greater diversity among offspring than does asexual reproduction?

a)

Only mitosis must occur in sexual reproduction

b)

New combinations of genes result from sexual reproduction.

c)

Sexual reproduction occurs at a faster rate.

d)

Mutations are caused by sexual reproduction.

12.

In guinea pig fur, long hair (L) and curly hair (C) are both dominant . What would the phenotype be for a guinea pig who was LlCc?

a)

Short, straight hair

b)

Long, straight hair

c)

Long, curly hair

d)

Short, curly hair

13.

Breeding of endangered species often still leads to extinction due to

a)

reduced genetic diversity

b)

increased fertility (offspring)

c)

increase in helpful mutations.

14.

Which of the males is the father of the offspring?

a)

Male 1

b)

Male 2

c)

Male 3

15.

What type of mutation has occurred in this chromosome?

a)

insertion

b)

substitution

c)

deletion

16.

Different forms of a gene are referred to as

a)

autosomes

b)

alleles

c)

chromatids

17.

The chances of developing cancer, diabetes, or sickle-cell anemia are higher if a family member also has the disorder because they are

a)

related to diet

b)

genetically based

c)

passed through blood contact

d)

highly infectious

18.
a)

4

b)

2

c)

6

d)

3

19.

For a mutation to pass to an offspring, it must occur in a

a)

muscle cell

b)

brain cell

c)

bone cell

d)

sex cell

20.

In the following cross TT x TT what ratio of the offspring will be homozygous recessive for the trait of tallness?

a)

0 in 4

b)

1 in 4

c)

2 in 4

d)

4 in 4

21.

An explanation of a body of facts based on substantial evidence that has been repeatedly confirmed through observation and experimentation.

a)

law

b)

theory

c)

hypothesis