28 25 15 15 20 25 30 Mean shell breadth of parents (mm) 24.18 The heritability of shell breadth in snails can be determined by regression of the mean phenotype of offspring against the mean phenotype of their parents. Mean shell breadth of offspring (mm) 20
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.
What conclusion can you draw from Figure 24.18 about the proportion
of
differences? Explain your reasoning.
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