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Question 41

In an exercise on genotype and phenotype, a student writes that the genotype of a tall plant is T. What is wrong with this?

  1. A genotype needs two allele symbols, not oneCorrect answer
  2. A genotype must always use a lower-case letter
  3. A genotype must name the characteristic in words
  4. Nothing is wrong with writing it this way

Explanation

The plant holds two alleles of the gene, one on each chromosome of the pair, so its genotype is written with two symbols such as TT or Tt. A single letter names one allele on its own and leaves the second position blank, so it cannot say which combination the plant actually has.

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