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Question 59

A Punnett square has BB written in one top margin cell and Bb in the other. Why is this wrong?

  1. Because the margin cells should hold the phenotypes of the offspring
  2. Because both margin cells must contain the same symbols
  3. Because the margins hold gametes, and a gamete carries one alleleCorrect answer
  4. Because a parent can only have one genotype at a time

Explanation

Each margin cell stands for one gamete, and a gamete receives just one of the two alleles a parent holds, so a two-letter entry there describes a body cell instead. Placing offspring information in the margins turns the diagram around, because that information is the result the boxes are meant to produce.

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Question 59: A Punnett square has BB written in one top margin cell and… · Genetics Basics · Questena