wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

Genetics: The Science of Heredity

Total questions: 12

Worksheet time: 11mins

Name
Class
Date
1.

The scientific study of heredity is called genetics.

a)

True

b)

False

2.

An organism's physical appearance is its genotype.

a)

True

b)

False

3.

In codominance, neither of the alleles is dominant or recessive.

a)

True

b)

False

4.

Which of the following is the first step in the formation of sex cells in an organism that has 8 chromosomes?

a)

The 2 chromatids of each chromosome separate.

b)

Chromosome pairs line up next to each other in the center of the cell.

c)

The DNA in the 8 chromosomes is copied.

d)

The chromatids move apart, producing cells with 4 chromosomes each.

5.

The different forms of a gene are called

a)

Alleles

b)

Chromosomes

c)

Phenotypes

d)

Genotypes

6.

The likelihood that a particular event will occur is called

a)

Chance

b)

Punnett Square

c)

Probability

d)

Recessive

7.

An organism with 2 identical alleles for a trait is

a)

heterozygous

b)

homozygous

c)

dominant

d)

recessive

8.

If the body cells of an organism have 10 chromosomes, then the sex cells produced during meiosis would have ____ chromosomes.

a)

5

b)

10

c)

15

d)

20

9.

Create a Punnett square and determine the probability for the following. Mom has Brown hair BB and Dad had Blonde hair bb. What is the probability that their baby has blonde hair?

a)

25%

b)

50%

c)

0%

d)

100%

10.

Create a Punnett square and determine the probability for the following. Mom and Dad are both heterozygous for freckles. The dominant gene is F and the recessive gene is f. What is the probability of their baby not having freckles.

a)

0%

b)

25%

c)

50%

d)

100%

11.

Create a Punnett square and determine the probability for the following. Mom is homozygous recessive and has white fur. Dad is homozygous dominant and has black fur. What is the probability that the babies will have black fur.

a)

0%

b)

25%

c)

50%

d)

100%

12.

Mom has white fur and dad has red fur. Their alleles are codominant. What will their babies look like?

a)

White

b)

Red

c)

Multicolor: Red and White (roan)

d)

Multicolor: Brown