Multiple Choice
In fundamental genetics, alternative forms of a gene are called what?
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
Which of the following is an example of a genotype (the allele combination an individual carries for a gene)?
A
Homozygous dominant
B
Blue eyes
C
Aa
D
Type O blood
Verified step by step guidance1
Understand the definition of genotype: it refers to the specific combination of alleles an individual carries for a particular gene, such as 'AA', 'Aa', or 'aa'.
Recognize that 'Homozygous dominant' describes a type of genotype where both alleles are dominant (e.g., 'AA'), but it is a descriptive term rather than the actual allele combination.
Identify that 'Blue eyes' is a phenotype, which is the observable trait resulting from the genotype and environmental factors, not the genotype itself.
Note that 'Type O blood' is also a phenotype, representing the blood group expressed, not the underlying allele combination.
Conclude that 'Aa' is the correct example of a genotype because it explicitly shows the allele combination (one dominant allele 'A' and one recessive allele 'a').
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