In a certain plant, leaf size is determined by fourgenes whose alleles assort independently and actadditively. Thus, alleles A, B, C, and D each add4 cm to leaf length and alleles A′, B′, C′, andD′ each add 2 cm to leaf length. Therefore,an AA BB CC DD plant has leaves 32 cm longand an A′A′ B′B′ C′C′ D′D′ plant has leaves16 cm long.a. If true-breeding plants with leaves 32 cm longare crossed to true-breeding plants with leaves16 cm long, the F1 will have leaves 24 cm longand the genotype AA′ BB′ CC′ DD′. Listall possible leaf lengths and their expectedfrequencies in the F2 generation produced fromthese F1 plants.
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.
In a certain plant, leaf size is determined by four
genes whose alleles assort independently and act
additively. Thus, alleles A, B, C, and D each add
4 cm to leaf length and alleles A′, B′, C′, and
D′ each add 2 cm to leaf length. Therefore,
an AA BB CC DD plant has leaves 32 cm long
and an A′A′ B′B′ C′C′ D′D′ plant has leaves
16 cm long.
a. If true-breeding plants with leaves 32 cm long
are crossed to true-breeding plants with leaves
16 cm long, the F1 will have leaves 24 cm long
and the genotype AA′ BB′ CC′ DD′. List
all possible leaf lengths and their expected
frequencies in the F2 generation produced from
these F1 plants.
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