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Using “T” to represent a dominant allele (version) of a gene and “t” for the recessive allele:

Which of the below combinations is homozygous dominant?
Which of the below combinations is homozygous recessive?
Which of the below combinations is heterozygous

1 answer

To classify the combinations of alleles:

  1. Homozygous Dominant: This means that both alleles are the same and both are dominant. The combination would be TT.

  2. Homozygous Recessive: This means that both alleles are the same and both are recessive. The combination would be tt.

  3. Heterozygous: This means that the two alleles are different, with one being dominant and the other recessive. The combination would be Tt.

In summary:

  • Homozygous Dominant: TT
  • Homozygous Recessive: tt
  • Heterozygous: Tt