I keep getting “Law of dominance” questions wrong in Principles of Inheritance and Variation. What's the trap?
thinking the recessive allele is lost or destroyed in the F1.
The usual trap: thinking the recessive allele is lost or destroyed in the F1. How to avoid it: the recessive allele is hidden, not lost -- it reappears in one quarter of the F2. Go back to the definition — in a heterozygote only the dominant allele is expressed while the recessive one stays masked.
Key point
Law of dominance
Common mistake
thinking the recessive allele is lost or destroyed in the F1.
Memory tip
the recessive allele is hidden, not lost -- it reappears in one quarter of the F2.
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