a) State the basic equation by which quantitative phenotypic variation is partit
ID: 176816 • Letter: A
Question
a) State the basic equation by which quantitative phenotypic variation is partitioned into genetic and environmental causes defining all terms. Then state the definition of broad sense heritability in the terms of this equation
b) What does wrong with the partition of causes in part a) if parents and offspring are not all subjected to the same range of variation in environmental conditions?
c) What feature of quantitative genetic cross, including P, F1, and F2 generations, shows that the old theory of blending inheritance is false?
Explanation / Answer
a) The phenotypic value of an individual is determined by the individual's genotype and the environment,
P = G + E,
where G is the genotypic value and E is the environmental deviation.
The heritability determines how rapidly the mean phenotype evolves in response to artificial or natural selection. Heretability is the proportion of the total phenotypic variance that is due to genetic causes. Broad sense heritability is based on the genotypic variance that measures the extent to which phenotypic variation is determined by genotypic variation and is mathematically calculated as :
h2B = VG / VP.
c) blending inheritance failed to explain the disappearance of traits for several generations. In blending inheritance, it was thought that inherted traits were determined randomly from a range bound bby the parent's homologous traits.
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