Multiple Choice
In the fundamentals of genetics, different versions of a gene are called:
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
In a Mendelian genetics problem, which genotype represents a homozygous dominant individual?
A
Aa
B
aa
C
AA
D
A_ (either AA or Aa)
Verified step by step guidance1
Understand the meaning of 'homozygous dominant': it refers to an individual having two copies of the dominant allele for a particular gene.
Recall that alleles are represented by letters, where uppercase letters (e.g., 'A') denote dominant alleles and lowercase letters (e.g., 'a') denote recessive alleles.
Identify the genotypes given: 'AA', 'Aa', and 'aa'. Here, 'AA' has two dominant alleles, 'Aa' has one dominant and one recessive allele, and 'aa' has two recessive alleles.
Recognize that 'homozygous' means both alleles are the same, so 'AA' and 'aa' are homozygous, while 'Aa' is heterozygous.
Conclude that the genotype representing a homozygous dominant individual is 'AA' because it has two dominant alleles.
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