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A real question from the bankBiology · Genetics

In a monohybrid cross, what proportion of the F₂ generation is expected to show the recessive phenotype?

A¼Correct answer
B½
C¾
DAll offspring

Why ¼ is correct

  1. 1Cross the F₁ heterozygotes: Aa × Aa.
  2. 2The possible genotypes are AA, Aa, Aa and aa.
  3. 3Only aa shows the recessive phenotype — 1 out of 4.

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Where marks are lost

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State the formula before substituting. Examiners award the method mark even when the arithmetic goes wrong.

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Answers given without units. The commonest avoidable loss in the whole paper, and it costs a mark every time.

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