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Question 36

Two guinea pigs both show the dominant form of a coat characteristic, yet one of their offspring shows the recessive form. Which explanation fits?

  1. One parent must be showing the recessive form after all
  2. The recessive form appeared without being inherited
  3. Both parents carry one dominant and one recessive alleleCorrect answer
  4. A recessive form can appear only if a parent already shows it

Explanation

Each parent looks dominant and yet must have handed on a recessive allele, and the only allele pair that does both jobs is a mixed pair in each parent. A parent with two recessive alleles would itself show the recessive form, which neither of these guinea pigs does.

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Question 36: Two guinea pigs both show the dominant form of a coat… · Genetics Basics · Questena