Punnett Square

What does the term "Recessive" refer to in genetics?

• A trait that is strong enough to be present in offspring

• A trait that is weak

• A combination of letters for genes

• A trait that is always dominant

What does the term "Allele" refer to in genetics?

• A trait that is strong enough to be present in offspring

• A trait that is weak

• A combination of letters for genes

• A trait that is always dominant

How are homozygous genes designated?

• A. By mixed letters

• B. By different letters

• C. By the same letter combination

• D. By numbers

Which of the following is an example of a homozygous recessive gene combination?

• A. BB

• B. Bb

• C. bb

• D. bB

In genetics, what does the term "homozygous" mean?

• Having two identical alleles for a trait

• Having two different alleles for a trait

• Having no alleles for a trait

• Having three alleles for a trait

What is the probability of a gg offspring?

• 1/4

• 2/4

• 3/4

• 4/4

What allele combination should go in the missing box?

• AA

• Aa

• aa

"S" is the dominant allele for smooth pea plants, while "s" is the recessive allele for wrinkled plants. If we cross two heterozygous round pea plants, what percent of the cross will be wrinkled?

• 25%

• 50%

• 75%

• 100%

The Punnett square predicts the ratio of genotypes in the offspring, based on the genotypes of the parents. In this cross, tallness (H) is dominant to shortness (h).

Based on the Punnett square, what is the phenotype of the offspring?

• Hh

• HH

• tall

• short

Fill in the Yellow Box

• AA

• Aa

• aa