2. A quantitative genetics determined the following variance components in a population of crabs found in the Gulf Coast. Additive genetic variance Dominance genetic variance Interaction genetic variance Environmental variance Leg length 3.4 1.7 0.6 2.4 Genetic-environmental variance 0 Body weight 2.7 1.6 0.8 3.7 0 a. Calculate the broad-sense heritability and the narrow-sense heritability for each trait in this population. b. Which trait would you expect to respond the best to selection? WHY?

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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.