Question Detail
Question
Choose the set of traits that would complete this Punnett square. R r on top, R r on side.
Correct Answer
Option B is the correct answer.
Detailed Explanation
A Punnett square for a cross between two heterozygotes (Rr x Rr) yields the following genotypic combinations: Top row, left box: R from first and R from second = RR. Top row, right box: R from first and r from second = Rr. Bottom row, left box: r from first and R from second = Rr. Bottom row, right box: r from first and r from second = rr. So the square is filled with RR, Rr, Rr, rr.
Hint
Do the cross: Rr x Rr. What are the four possible genotype combinations?