Practice 3, no points. A variety of pea plant known as Blue Pamlico produces a tall plant with blue seeds. A second variety of pea plant called Mulberry Dwarf produces a short plant with white seed. The two varieties are crossed and the seeds are collected. All the seeds are white. When planted, the seeds all produce tall plants. These tall plants are allowed to self-fertilize. For the F2 generation, 94 plants had blue seeds and were tall, 272 plants had white seeds and were tall, 31 plants had blue seeds and were short, and 89 plants had white seeds and were short. a)Which phenotypes are dominant and why? b)What would be the expected distribution of phenotypes in the F2 generation if the alleles of the genes assort independently? c)Perform chi square analysis on the distribution of phenotypes in the F2 generation d) Are these results consistent with the hypothesis of independent assortment? Explain using the results of your chi squared analysis.
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.
Practice 3, no points.
A variety of pea plant known as Blue Pamlico produces a tall plant with blue seeds. A second variety of pea plant called Mulberry Dwarf produces a short plant with white seed. The two varieties are crossed and the seeds are collected. All the seeds are white. When planted, the seeds all produce tall plants. These tall plants are allowed to self-fertilize. For the F2 generation, 94 plants had blue seeds and were tall, 272 plants had white seeds and were tall, 31 plants had blue seeds and were short, and 89 plants had white seeds and were short.
a)Which
b)What would be the expected distribution of phenotypes in the F2 generation if the alleles of the genes assort independently?
c)Perform chi square analysis on the distribution of phenotypes in the F2 generation
d) Are these results consistent with the hypothesis of independent assortment? Explain using the results of your chi squared analysis.
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