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السؤال 71

Two heterozygous pea plants are crossed, and exactly four seeds are collected and grown. Which statement about those four seedlings is correct?

  1. Exactly one of them must show the recessive characteristic, since the ratio is 3 to 1
  2. It is likely that two of them show the recessive characteristic
  3. It is possible that none of them shows the recessive characteristicالإجابة الصحيحة
  4. All four must show the dominant characteristic

الشرح

Each seed is settled on its own, and the result for one seed leaves the other three untouched, so four seedlings all showing the dominant characteristic is one of the possible outcomes. Insisting on exactly one recessive seedling would only make sense if the four seeds shared out a fixed set of results between them, which is not how their alleles are assembled.

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السؤال 71: Two heterozygous pea plants are crossed, and exactly four… · Genetics Basics · Questena