Suppose that gene A controls the synthesis of blue pigment in the petals of a flowering plant.Plants with genotype A/A produce blue pigment in their petals,while those with genotype A/a or a/a do not produce any blue pigment.The expected narrow-sense heritability (h²)for the production of blue pigment in this plant's flowers is: A)exactly 0. B)exactly 0.5. C)higher than 0,but lower than 1. D)exactly 1. E)dependent on the environmental variance.

Question

Quizplus · Accepted Answer

Narrow-sense heritability (h^2) includes only the additive genetic variance component of the total phenotypic variance. In this case, the presence or absence of blue pigment is determined entirely by the genotype at a single gene locus (A/A vs. A/a or a/a), indicating that the trait is entirely genetically determined with no influence from the environment or non-additive genetic factors. Therefore, the narrow-sense heritability for the production of blue pigment in this scenario is exactly 1.

Suppose That Gene a Controls the Synthesis of Blue Pigment