What is a method to determine the average effect on offspring phenotype for a quantitative trait?

What is a method to determine the average effect on offspring phenotype for a quantitative trait?

• A. By combining the effects of all loci and use phenotypic info on the individual and relatives
• B. By examining only the parent with the higher trait value
• C. By ignoring environmental factors
• D. By measuring offspring only

Answer: (A)

For quantitative traits influenced by many genes, the offspring phenotype reflects the additive effects of alleles across the genome plus environmental input. To estimate the average effect on offspring, you need to sum or model the contributions from all loci (the additive genetic value) and use phenotypic information not only from the individual but also from relatives. Relatives share portions of their genes, so including their phenotypes helps separate genetic effects from environmental influences and improves estimates of how the genotype will translate into offspring phenotype when alleles are passed to the next generation. Measuring only one parent or ignoring environmental factors or offspring data fails to capture the full genetic contribution and how it is transmitted, leading to biased or incomplete estimates.

For quantitative traits influenced by many genes, the offspring phenotype reflects the additive effects of alleles across the genome plus environmental input. To estimate the average effect on offspring, you need to sum or model the contributions from all loci (the additive genetic value) and use phenotypic information not only from the individual but also from relatives. Relatives share portions of their genes, so including their phenotypes helps separate genetic effects from environmental influences and improves estimates of how the genotype will translate into offspring phenotype when alleles are passed to the next generation. Measuring only one parent or ignoring environmental factors or offspring data fails to capture the full genetic contribution and how it is transmitted, leading to biased or incomplete estimates.