Multiple Choice
Which of the following best defines a gene?
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
In a simple Mendelian trait where A is the dominant allele and a is the recessive allele, which genotype is homozygous dominant?
A
B
C
A
D
Verified step by step guidance1
Understand the meaning of homozygous and heterozygous: Homozygous means having two identical alleles for a particular gene, while heterozygous means having two different alleles.
Identify the alleles given: 'A' is the dominant allele and 'a' is the recessive allele.
List the possible genotypes: AA, Aa, and aa.
Determine which genotype is homozygous dominant: Since 'A' is dominant, the homozygous dominant genotype must have two 'A' alleles, which is 'AA'.
Confirm that 'aa' is homozygous recessive and 'Aa' is heterozygous, so neither is homozygous dominant.
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