Comparisons of traits in identical and fraternal twins are useful because they:
A)allow estimates of the number of genes affecting a complex trait.
B)reveal the extent of genotype-by-environment interaction in causing phenotypic variation.
C)reveal the relative importance of genes and environment in causing phenotypic variation.
D)None of the answer options is correct.

Question

Quizplus · Accepted Answer

Comparing traits in identical and fraternal twins allows researchers to estimate the relative importance of genes and environment in causing phenotypic variation. By comparing the similarity of traits in identical twins (who share 100% of their genes) and fraternal twins (who share on average 50% of their genes), researchers can estimate the heritability of a trait, or the proportion of phenotypic variation that can be attributed to genetic differences. This information can be useful for understanding the genetic basis of complex traits and for informing interventions aimed at improving health outcomes.

Comparisons of Traits in Identical and Fraternal Twins Are Useful