Which term describes a method for estimating heritability by analyzing concordance rates in monozygotic and dizygotic twins?

Which term describes a method for estimating heritability by analyzing concordance rates in monozygotic and dizygotic twins?

• A. Heritability
• B. Direction?al selection
• C. Twin method
• D. Gene flow

Answer: (C)

The main idea here is using twin comparisons to estimate how much genetics contribute to a trait. Because identical twins share essentially all their genes and fraternal twins share about half, looking at how often both twins show the trait (concordance) in each group lets us gauge genetic influence. This approach is known as the twin method. By comparing concordance rates, researchers can approximate heritability, often with the rough formula h^2 ≈ 2*(r_MZ − r_DZ), where r represents similarity for the trait in each twin type. It’s important to remember this method assumes similar environments for both twin types and can be affected by shared environmental factors. Other terms like heritability (a statistical concept), directional selection (a mode of evolution), and gene flow (migration of genes between populations) describe different ideas, not this twin-based estimation method.

The main idea here is using twin comparisons to estimate how much genetics contribute to a trait. Because identical twins share essentially all their genes and fraternal twins share about half, looking at how often both twins show the trait (concordance) in each group lets us gauge genetic influence. This approach is known as the twin method. By comparing concordance rates, researchers can approximate heritability, often with the rough formula h^2 ≈ 2*(r_MZ − r_DZ), where r represents similarity for the trait in each twin type. It’s important to remember this method assumes similar environments for both twin types and can be affected by shared environmental factors. Other terms like heritability (a statistical concept), directional selection (a mode of evolution), and gene flow (migration of genes between populations) describe different ideas, not this twin-based estimation method.