AGB-0062
QUESTION
What is genetic covariance between half-sibs?
OPTIONS
(A) ¼ VA
(B) ½ VA
(C) ¾ VA
(D) ½ VA + ¼ VD + VEC
ANSWER
(A) ¼ VA
EXPLANATION
Genetic covariance between half-sibs is one-quarter of the additive genetic variance, ¼VA, because half-sibs share on average one-quarter of their additive genes through a common parent. The other expressions overestimate the additive relationship or include inappropriate dominance/environmental components for the standard half-sib covariance.
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