Identify descriptions as broad sense or narrow sense heritability in sexually reproducing, diploid populations.

Expert Solution

If we consider the Phenotype variation in terms of heritability, it may be measured as:

1. Broad sense heritability- measured in terms of, phenotype variance due to total genetic variance.

H² = V_G/ V_P

V_{P =} V_G+ VE

Thus, measures environmental effects

1. Narrow sense heritability - measured in terms of, phenotype variance due to additive factors, or variation due to effects on genes that is transmitted among generations-

h² = V_A/ V_P or h² = VA/ V_A + V_D + V_I

Thus, measures additive effect, dominance and epistatic effects.

This help in measuring the relation to offspring (as dominance and epistatic interaction is measured).

Effect of environment help to establish evolutionary effects by natural selection.

Thus, the genetic constitution of each parent is different, originating from maternal and paternal lineages. 50% of genes come from father and 50% from mother, which are further influenced by their genetic lineages. The inheritance may also be affected as autosomal or sex-linked modes, as X and Y chromosomes will have different genotypic effect.

Also there is environmental effect on genes which vary according to its effect on genes of the offspring.

Broad sense	Narrow sense
The proportion of phenotypic variance due to total genetic variance	the proportion of phenotypic variance due to only the additive effect
is a useful method to measure genetic versus environmental effects on phenotypic variance	includes genetic variance due to epistasis, dominance, and additive effects
can be used to predict evolution through natural selection	describes how closely offspring resemble their parents

gladiator answered 2 years ago

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