Copy of Monohybrid Cross Prac 2 (5/28/2026)

In guinea pigs, Black fur (B) is dominant to white fur (b), which is recessive.

Complete a cross between a guinea pig that is heterozygous for black fur (Bb) with a guinea pig that is homozygous recessive for white fur (bb) - Bb x bb.

After you complete the cross, answer the following fill-in-the-blank questions.

1. 2. 3. 4.

5. 6. 7. 8.

Expected number of offspring:

Black fur (BB, Bb)

White fur (bb)

In guinea pigs, Black fur (B) is dominant to white fur (b), which is recessive.

Complete a cross between two guinea pigs that are both heterozygous for black fur.

After you complete the cross, answer the following fill-in-the-blank questions (match up the information per the numbers on the Punnett square and the blanks below).

1. 2. 3. 4.

5. 6. 7. 8.

Expected number of offspring:

Black fur

White fur

In cattle, having horns (H) is dominant to hornless (h), which is recessive.

Complete a cross between a true breeder for horned with a true breeder hornless cattle.

After you complete the cross, answer the following fill-in-the-blank questions.

1. 2. 3. 4.

5. 6. 7. 8.

Expected number of offspring:

Horned

Hornless

In tomatoes, red fruit (R) is dominant over yellow fruit (r). A plant that is homozygous for red fruit is crossed with a plant that has yellow fruit. What would be the genotypes and phenotypes of the F₁ generation?

Parents x

After you complete the cross, answer the following fill-in-the-blank questions.

1. 2. 3. 4.

5. 6. 7. 8.

F₁ generation genotypes:

F₁ generation phenotypes:

In humans, being a tongue roller (R) is dominant over non-roller (r). A man who is a non-roller marries a woman who is heterozygous for tongue rolling.

Father's genotype:

Father's phenotype:

Mother's genotype:

Mother's phenotype:

What is the probability (percentage or fraction) of having a child that is a tongue roller?