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Genetics Test Review Biology 2

Total questions: 16

Worksheet time: 8mins

Name
Class
Date
1.

Individuals with a recessive genetic disorder called galactosemia cannot properly break down the sugar galactose. What is the percent chance that the biological child of two heterozygous individuals will have galactosemia?

a)

0

b)

25

c)

75

d)

100

2.

In humans, the brown-eye (B) allele is dominant to the blue-eye alelle (b). If a homozygous dominant person has babies with a homozygous recessive person, what is the probability of having a child that is bb?

a)

0

b)

25

c)

50

d)

100

3.

If you inherit the gene for Huntington's disease, you contract the disease.  Huntington’s disease is best described as:

a)

Recessive

b)

Incompletely dominant

c)

Codominant

d)

Dominant

4.

If you inherit only one allele for muscular dystrophy, you are considered a carrier and do not have the disease. What type of disorder is muscular dystrophy?

a)

Dominant

b)

Recessive

c)

Incompletely dominant

d)

Codominant

5.

Is the karyotype attached here showing the diploid or haploid number of chromosomes for a human female?

a)

Diploid

b)

Haploid

6.

Is the karyotype attached haploid or diploid for a human female?

a)

Diploid

b)

Haploid

7.

What sex chromosomes do people born female have?

a)

XY

b)

XX

8.

What sex chromosomes do people born male have?

a)

XY

b)

XX

9.

How many alleles do males inherit of a gene that is on the X chromosome?

a)

1

b)

2

c)

4

10.

If yellow peas (Y) are dominant to green peas (y), what are the genotypes possible for yellow peas?

a)

YY and Yy

b)

Only yy

c)

Yy and yy

d)

YY and yy

11.

What gametes are produced from a diploid cell with the genotype Rr?

a)

R, R, r, r

b)

RR, rr, Rr, Rr

c)

Rr, Rr, Rr, Rr

d)

R, R, R, r

12.

When a haploid egg and a haploid sperm join together during fertilization, what is formed?

a)

A diploid zygote

b)

A haploid zygote

c)

A diploid unfertilized egg

d)

A triploid zygote

13.

Traits are affected by genetics and the environment. Identical twins are more likely to have the same eye color than both have diabetes. Which of those two traits is influenced by genetics--NOT the environment?

a)

Same eye color

b)

Diabetes

14.

How many copies of each chromosome does a diploid zygote have?

a)

1

b)

2

c)

3

d)

4

15.

How many alleles from each parent does a child receive?

a)

1

b)

2

c)

3

d)

4

16.

Which of the following is NOT a gamete found in humans?

a)

Pollen

b)

Sperm

c)

Egg