A Student Proposes That Left-Handedness Is a Recessive Trait That

question 20

Multiple Choice

A student proposes that left-handedness is a recessive trait that is therefore hidden in much of the human population. 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 genotypes and allele frequencies be in this theoretical population?

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

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Definitions:

Selective Demand

Demands aimed at persuading customers to buy specific brands or products instead of general product categories.

Primary Demand

The overall demand for a product category or industry, as opposed to demand for a specific brand within that category.

Generic Demand

The overall demand for a category of products or services, not linked to any specific brand or model.

Product Class

A broad category of products that serve a similar function or are targeted at a similar customer segment.