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Question 47

A seed catalogue describes a variety as true-breeding for pod colour. Which statements follow? Select all that apply.

  1. The plants are homozygous for that geneCorrect answer
  2. The plants must carry the dominant allele
  3. The plants are heterozygous for that gene
  4. Crossing two of these plants gives offspring with the same pod colourCorrect answer

Explanation

Breeding true means the two alleles for the gene are the same in every plant of the variety, so each gamete carries that one allele and the offspring receive the same pair as their parents. A variety can breed true for the recessive form quite as easily as for the dominant one, and a mixed pair would not breed true at all.

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Question 47: A seed catalogue describes a variety as true-breeding for… · Genetics Basics · Questena