& which genotypes produce the same phenotype ifallele a is dominant?
a)aa and aa
a)aa and aa
c)aa and aa
d)dall of the above

B

Explanation:

A denotes a dominant allele, a denotes a recessive allele. Therefore, if there are two a alleles (aa) the recessive phenotype will be presented. However, the presence of the A allele (either as heterozygous Aa or homozygous AA) will present the dominant phenotype.

a) AA will present dominant phenotype, aa will present recessive phenotype

b) AA will present dominant phenotype, Aa will present dominant phenotype

c) Aa will present dominant phenotype, aa will present recessive phenotype.

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