A Student Proposes That Left-Handedness Is a Recessive Trait

question 22

Multiple Choice

A student proposes that left-handedness is a recessive trait. A survey of a class of 36 students finds that 27 (0.75) are right-handed and 9 (0.25) are left-handed. Using the Hardy-Weinberg formula, what would the expected genotype and allele frequencies be in this theoretical population?

• A) 0.75 right-handed homozygous dominant and 0.25 recessive homozygous for 3-to-1 right- to left-handed alleles in the population
• B) 0.25 right-handed homozygous, 0.50 heterozygous, and 0.25 recessive homozygous for a 3-to-1 right- to left-handed alleles in the population
• C) 0.25 right-handed homozygous, 0.50 heterozygous, and 0.25 recessive homozygous for a 0.5 allele frequency for each allele
• D) 0.50 right-handed homozygous, 0.25 heterozygous, and 0.25 recessive homozygous for a 0.5 allele frequency for each allele
• E) They cannot be estimated using these limited data.

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