Final answer:
The answer to which option represents a homozygous dominant allele is A) GG. This option consists of two identical dominant alleles, which is the definition of a homozygous dominant genotype.
Step-by-step explanation:
A homozygous dominant allele consists of two dominant alleles. In other words, if an allele pair contains identical alleles and both are dominant, this configuration is referred to as homozygous dominant. For example, in genetic notation, 'AA' would denote a homozygous dominant pair because both alleles are dominant and identical. On the contrary, 'aa' would indicate a homozygous recessive pair with two recessive alleles, and 'Aa' would represent a heterozygous pair with one dominant and one recessive allele.
Considering the provided options:
- A) GG - represents two dominant alleles and is therefore homozygous dominant.
- B) Ww - contains one dominant and one recessive allele, making it heterozygous.
- C) bb - consists of two recessive alleles and is thus homozygous recessive.
- D) tt - is also homozygous recessive with two recessive alleles.
The correct answer to the question "Which of the following is a homozygous dominant allele?" is A) GG, as it contains two identical dominant alleles.