AnswersBiologyN/A — ExamQuestion 8
8
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N/A — Exam

Question 8 • Biology

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A parakeet that is heterozygous for blue feathers (dominant) is crossed with a parakeet that is homozygous for white feathers (recessive). According to the Punnett square for this cross, what percentage of offspring is predicted to have blue feathers?

Answer
A
100 percent
B
25 percent
C
75 percent
D
50 percent

Explanation

Let B represent the dominant blue-feather allele and b the recessive white-feather allele. The heterozygous blue parakeet is Bb, and the homozygous white parakeet is bb. Their offspring are predicted to be half Bb (blue) and half bb (white), so 50 percent will have blue feathers, choice 50 percent.

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