In some plants, a purple pigment is synthesized from a colorless precursor. In a cross between two parental plants, one purple and the other colorless, an F1 generation was produced that was all purple. The F2 produced from the F1 had 775 purple, 200 red and 65 colorless plants. What mode of inheritance and phenotypic ratio do these results suggest? Incomplete dominance, 1:2:1 phenotype ratio Dominant epistasis, 12:3:1 phenotype ratio Codominance, 1:2:1 phenotype ratio Recessive epistasis, 9:3:4 phenotype ratio
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 some plants, a purple pigment is synthesized from a colorless precursor. In a cross between two parental plants, one purple and the other colorless, an F1 generation was produced that was all purple. The F2 produced from the F1 had 775 purple, 200 red and 65 colorless plants. What mode of inheritance and phenotypic ratio do these results suggest?
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Incomplete dominance, 1:2:1 |
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Dominant epistasis, 12:3:1 phenotype ratio |
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Codominance, 1:2:1 phenotype ratio |
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Recessive epistasis, 9:3:4 phenotype ratio |
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