What does a high heritability value indicate about a trait?

What does a high heritability value indicate about a trait?

• A. A trait is strongly influenced by environmental factors
• B. A trait is largely determined by genetic factors
• C. A trait cannot be improved through breeding
• D. A trait shows no genetic variance

Answer: (B)

A high heritability value signifies that a trait is largely determined by genetic factors. This indicates that the variation observed in that trait among individuals within a population is predominantly due to their genetic differences. For example, if a trait, such as height in a population, has a high heritability estimate, it suggests that genetic makeup plays a significant role in determining that trait, making it more predictable in future generations when individuals breed.

In contrast, traits with low heritability values are more influenced by environmental factors, meaning that external conditions can have a larger impact on the expression of the trait than genetic makeup. Additionally, a high heritability does not imply that the trait cannot be improved through breeding; rather, selective pressure based on genetic predispositions can enhance traits over time. The concept of heritability also does not relate to the absence of genetic variance, as a high heritability reflects significant genetic variation that contributes to the differences in the trait among individuals.