Punnett Square Worksheet

1. A Punnett square is used for:

• predicting the outcome of genetic crosses

• measuring the mass of an object

• determining the speed of a vehicle

• calculating the area of a square

In a Punnett square, what do capital letters represent?

• Dominant alleles

• Recessive alleles

• Homozygous traits

• Heterozygous traits

3. What do lowercase letters represent in a Punnett square?

• Dominant alleles

• Recessive alleles

• Homozygous alleles

• Heterozygous alleles

If both parents have a dominant trait (BB), what will their children have?

• All children will have the dominant trait (BB).

• Some children will have the dominant trait (BB), some will not.

• None of the children will have the dominant trait (BB).

• It's impossible to determine.

5. What shape is a simple Punnett square?

• Circle

• Triangle

• Square

• Rectangle

6. How many boxes are in a simple Punnett square?

• 2

• 4

• 6

• 8

7. If one parent has "Bb" and the other has "bb", what type of cross is this?

• Monohybrid cross

• Dihybrid cross

• Hybrid Cross

• Back cross

10. What is a genotype?

• A type of cell

• The genetic makeup of an organism

• A physical trait

• A type of protein

If both parents have "bb", what will their children have?

• BB

• Bb

• bb

• bB

12. What fraction of a Punnett square shows one possible outcome?

• 1/4

• 1/2

• 1/3

• 1/8