18 (3 points) The components of genetic variance (Va) can be summarized: Keep in

Question

18 (3 points) The components of genetic variance (Va) can be summarized: Keep in mind that the terms sum to total genetic variance, so your answers for the components should make sense relative to each other. For example, they do not overlap. What is VA. What does the "A" stand for, and what does this mean? What is Vo. What does the "D" stand for, and What does this mean? deviation What is Vi. What does the "" stand for, and what does this mean? 19 (2 points) For many characteristics, the phenotypes of individuals in a population fall on a range without clear divisions. They are said to be quantitative or continuous. WHY are they called quantitative? 20 (2 poi nts) Broad-sense heritability and narrow-sense heritability are both measures of the impact of genetic variance on the phenotypic variance for a characterist is the difference between broad- and narrow-sense heritability? ic. What -2 3

Explanation / Answer

18) The total genetic variance is a character of -

19) The phenotypic trait varies continuously from one phenotypic extreme to other are described as continuous or quantitative traits. These are governed by many genes at different loci and each contributing small amount to the phenotype that determines the expression of a given trait. In quantitative traits, no allelic pairs exhibit dominance and there is no genetic interaction and no linkage between the loci.

20) Phenotype that vary between the individuals in a population is caused by both environmental factors and the genetic factors as well as the interaction between genes and environmental factors. Heritability describes how much variation in a trait is due to variation in genetic factors.

Broad sense heritability shows all the possible phenotypic variance due to the genotype.

Narrow sense heritability includes genetic variation that is due to additive gentic values VA

h2 = VA/ VP

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