9ו 18 17 Selection for 16 high oil content 15 14 13 12 11 10 Selection for 4 low oil content 3 0 10 20 30 40 50 60 70 80 Generation 24.22 In a long-term response-to-selection experiment, selection for oil content in cor increased oil content in one line to about 20%, whereas it almost eliminated it in another line. Percentage of oil content
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.
Has the response to selection leveled off in the strain of corn selected for
high oil content shown in Figure 24.22? What does this observation
suggest about
content?
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