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Question 68

A breeder crosses two heterozygous rabbits and reads a predicted ratio of 3 to 1 from the Punnett square. What does that ratio actually tell the breeder?

  1. That a litter of four will contain exactly one offspring with the recessive characteristic
  2. That the first three offspring will show the dominant characteristic and the fourth will not
  3. That every litter from this pair will contain four offspring
  4. That each offspring faces those odds, rather than a fixed count for the litterCorrect answer

Explanation

A Punnett square lists the outcomes that are equally likely each time a gamete from one parent meets a gamete from the other, so it sets the odds facing an individual offspring rather than filling in a birth list. A litter is not obliged to divide itself in those proportions, and expecting one recessive offspring in every four treats a chance as a quota.

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Question 68: A breeder crosses two heterozygous rabbits and reads a… · Genetics Basics · Questena