In a breeding program, which sense of heritability is primarily of interest?

In a breeding program, which sense of heritability is primarily of interest?

• A. Broad sense
• B. Narrow sense
• C. Overall sense
• D. Specific sense

Answer: (B)

In a breeding program, the narrow sense of heritability is primarily of interest because it measures the proportion of phenotypic variance that can be attributed to additive genetic variance among individuals in a population. This concept is crucial for breeders as it helps predict the response to selection.

When breeders aim to improve a trait, they are often concerned with the additive effects of alleles, which are cumulative and can be directly passed from parent to offspring. This allows for better estimates of how effective selective breeding will be for enhancing specific traits in subsequent generations. Thus, narrow sense heritability provides the critical information necessary to make informed decisions about breeding strategies and to anticipate the genetic gain in offspring from specific breeding pairs.

In contrast, broad sense heritability encompasses all genetic contributions to phenotypic variance, including dominance and epistatic interactions, but does not provide the same predictive power regarding responses to selection that narrow sense heritability does. The overall or specific senses mentioned in other options are not standard terms used in the context of genetic breeding programs, making those less relevant in this scenario.