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Question 27

How many copies of a dominant allele are needed before its characteristic shows?

  1. Two copies are needed
  2. It depends on which parent supplied the allele
  3. One copy is enoughBonne réponse
  4. It shows only in a true-breeding organism

Explication

A dominant allele has its effect whenever it is present, so the characteristic appears in an organism with a single copy just as it does in an organism with two. Requiring the allele twice is the condition that belongs to a characteristic which is masked, and the parent an allele came from makes no difference to how it behaves.

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Question 27: How many copies of a dominant allele are needed before its… · Genetics Basics · Questena