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Question 96

Identical twins carry the same alleles as each other. One twin has a noticeably higher body mass than the other. What must be causing that difference?

  1. A difference in the alleles they carry
  2. A mutation that one twin inherited and the other did not
  3. A difference in the conditions each of them has lived inCorrect answer
  4. The fact that one twin was born a few minutes earlier

Explanation

Where the inherited instructions are the same for both individuals, nothing about those instructions can account for a difference between them, so the cause has to lie in what has happened to them since. Food, exercise and illness differ even between twins raised in one house, and those are environmental factors rather than inherited ones.

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Question 96: Identical twins carry the same alleles as each other. One… · Genetics Basics · Questena