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If a trait is controlled by a single gene with two alleles, what is the maximum

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Question: If a trait is controlled by a single gene with two alleles, what is the maximum number of different genotypes possible in a population?

Options:

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Correct Answer: 4

Solution: 

For a single gene with two alleles, the maximum number of different genotypes possible is 3: homozygous dominant, heterozygous, and homozygous recessive.

If a trait is controlled by a single gene with two alleles, what is the maximum

Practice Questions

Q1
If a trait is controlled by a single gene with two alleles, what is the maximum number of different genotypes possible in a population?
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Questions & Step-by-Step Solutions

If a trait is controlled by a single gene with two alleles, what is the maximum number of different genotypes possible in a population?
Correct Answer: 3
  • Step 1: Understand that a gene can have different forms called alleles. In this case, there are two alleles.
  • Step 2: Label the two alleles. Let's call one allele 'A' (dominant) and the other 'a' (recessive).
  • Step 3: Determine the possible combinations of these alleles in an individual. There are three combinations: 'AA', 'Aa', and 'aa'.
  • Step 4: 'AA' is called homozygous dominant, 'Aa' is called heterozygous, and 'aa' is called homozygous recessive.
  • Step 5: Count the different combinations. There are a total of 3 different genotypes: homozygous dominant (AA), heterozygous (Aa), and homozygous recessive (aa).
  • Genotype and Alleles – Understanding how alleles combine to form different genotypes, specifically in the context of Mendelian genetics.
  • Homozygous vs Heterozygous – Differentiating between homozygous dominant, homozygous recessive, and heterozygous genotypes.
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