In a species of plant, two genes control flower color. The redallele (R) is dominant to the white allele (r); the color-producingallele (C) is dominant to the non-color-producing allele (c). Yoususpect that either an rr homozygote or a cc homozygote willproduce white flowers. In other words, rr is epistatic to C, andcc is epistatic to R. To test your hypothesis, you allowed heterozygousplants (RrCc) to self-fertilize and counted the phenotypesof the offspring. You obtained the following data: 201 plantswith red flowers and 144 with white flowers. Conduct a chisquare test to see if your observed data are consistent with yourhypothesis.
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 species of plant, two genes control flower color. The red
allele (R) is dominant to the white allele (r); the color-producing
allele (C) is dominant to the non-color-producing allele (c). You
suspect that either an rr homozygote or a cc homozygote will
produce white flowers. In other words, rr is epistatic to C, and
cc is epistatic to R. To test your hypothesis, you allowed heterozygous
plants (RrCc) to self-fertilize and counted the phenotypes
of the offspring. You obtained the following data: 201 plants
with red flowers and 144 with white flowers. Conduct a chi
square test to see if your observed data are consistent with your
hypothesis.
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