Seed weight in a particular plant species is determined by pairs of alleles attwo loci (a+ a− and b+ b−) that are additive and equal in their effects. Plantswith genotype a− a− b− b− have seeds that average 1 g in weight, whereasplants with genotype a+ a+ b+ b+ have seeds that average 3.4 g in weight. Aplant with genotype a− a− b− b− is crossed with a plant of genotype a+ a+ b+b+.a. What is the predicted weight of seeds from the F1 progeny of this cross?b. If the F1 plants are intercrossed, what are the expected seed weights andproportions of the F2 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.
Seed weight in a particular plant species is determined by pairs of alleles at
two loci (a+ a− and b+ b−) that are additive and equal in their effects. Plants
with genotype a− a− b− b− have seeds that average 1 g in weight, whereas
plants with genotype a+ a+ b+ b+ have seeds that average 3.4 g in weight. A
plant with genotype a− a− b− b− is crossed with a plant of genotype a+ a+ b+
b+.
a. What is the predicted weight of seeds from the F1 progeny of this cross?
b. If the F1 plants are intercrossed, what are the expected seed weights and
proportions of the F2 plants?
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