Chapter 2 Answers
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- No, it’s not necessary to write out a Punnett square in a true square 2×2 or 4×4, etc. For simplicity you can remove the duplicate gametes, and you will still get the same ratio. It isn’t incorrect to write it out fully though. For the Punnett square on the right, you can simplify it as:
- The 9:3:3:1 ratio would change, depending on whether the two mutants were in coupling or repulsion.
If in coupling (AB/ab), the 9 and 1 would go up and the 3s would go down (10.6: 1.44: 1.44: 2.56).
If in repulsion (Ab/aB), the 9 and 1 would go down and the 3s up. (8.16: 3.84: 3.85: 0.16) - Two classes (the parentals) would increase, while two classes would decrease (the recombinants).
