Multiple choice

Which of the following options is a homozygous-dominant dihybrid condition?

  1. TTRR

  2. Ttrr

  3. TtRr

  4. ttRr

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A Correct answer
Explanation

Homozygous dominant means having two dominant alleles for each gene. TTRR shows dominant alleles (TT) for one trait and dominant alleles (RR) for another trait. TtRr is heterozygous, Ttrr is heterozygous-homozygous recessive, and ttRr is homozygous recessive-heterozygous.