A complementation analysis was performed using pea plants which normally have purple flowers. Twenty-five mutants for white flower colour were discovered across 10 populations. The mutants were bred in a complementation test which showed two complementation groups with 10 mutants in one group and 15 in the other. (a) How many genes contribute to flower colour in pea plants based on this data? (b) Is it likely that more genes contribute to pea plant flower colour? Explain

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A:

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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.