B

b figure 9-10

If a black guinea pig is crossed with a brown guinea pig and even one of the offspring is brown, the black guinea pig is heterozygous for coat color.

Bb

Bb

bb

If a black guinea pig is crossed with a brown guinea pig and even one of the offspring is brown, the black guinea pig is heterozygous for coat color.

figure 9-11

When red-flowering four o'clocks are crossed with white-flowering four o'clocks, all of the F1 offspring produce pink flowers, an intermediate between the two parental phenotypes. When the F1 generation is interbred, red-flowering, pink-flowering, and white-flowering plants are produced because the trait for red flower color has incomplete dominance over the trait for white flower color.

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