Multiple Choice
In Mendelian genetics, which of the following is an example of a genotype (the allele combination of an individual)?
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
Which of the following is an example of a genotype?
A
Aa
B
Homozygous dominant
C
Brown eyes
D
A fertilized egg (zygote)
Verified step by step guidance1
Understand the definition of genotype: A genotype refers to the genetic makeup of an organism, specifically the combination of alleles it carries for a particular gene.
Recognize that genotypes are represented by letters denoting alleles, such as 'A' and 'a', where uppercase usually indicates a dominant allele and lowercase a recessive allele.
Analyze each option: 'Aa' shows a combination of two different alleles, which is a classic example of a genotype (heterozygous).
'Homozygous dominant' describes a genotype where both alleles are dominant (e.g., 'AA'), but the phrase itself is a description, not the genotype notation.
'Brown eyes' is a phenotype, which is the observable trait resulting from the genotype, and 'a fertilized egg (zygote)' is a developmental stage, not a genotype.
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