Biologyhard · Past Paper
In a test cross involving F1 dihybrid (RrYy), the phenotypic ratio will be:
A9:3:3:1
B1:1:1:1
C3:1
D1:2:1
✓ Correct Answer: B — 1:1:1:1
Crossing RrYy with rryy results in four phenotypes in equal proportion (1:1:1:1).
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