Some plants occur in one of the two sizes: tall or dwarf. This characteristic is controlled by one pair of genes. Tallness is dominant to dwarfness. Choose suitable letters for this gene pair.

Correct answer: Tt denotes tallness dominant to dwarfness.

Explanation:

T denotes dominant gene as tall; while t denotes recessive gene as a dwarf.

For tallness, the gene pair can be denoted by TT or Tt.

For dwarfness, the gene pair can be denoted by tt.
 But only Tt is the gene pair which shows that T is dominant over t, expressing tallness in the plant.

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Updated on: 21-Mar-2023

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