Population A consists of 100 hens that are fully isogenicand that are reared in a uniform environment. Theaverage weight of the eggs they lay is 52 g, and the variance is 3.5 g2. Population B consists of 100 geneticallyvariable hens that produce eggs with a mean weight of52 g and a variance of 21.0 g2. Population B is raised in anenvironment that is equivalent to that of Population A.What is the environmental variance (Ve) for egg weight?What is the genetic variance in Population B? What is thebroad-sense heritability in Population B?
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
Population A consists of 100 hens that are fully isogenic
and that are reared in a uniform environment. The
average weight of the eggs they lay is 52 g, and the variance is 3.5 g2. Population B consists of 100 genetically
variable hens that produce eggs with a mean weight of
52 g and a variance of 21.0 g2. Population B is raised in an
environment that is equivalent to that of Population A.
What is the environmental variance (Ve) for egg weight?
What is the genetic variance in Population B? What is the
broad-sense heritability in Population B?
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