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Two true breeding pepper plans lines P1 and P2 produce peppers with weights of 9oz and 5oz. When the two lines are crossed the F1 has an average weight of 7oz and a variance of 1.0. The F2 has an average weight of 7oz and a variance of 3.0. What is H^2?

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Reid Wolff
Reid WolffLv2
28 Sep 2019
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When true-breeding pepper plants with round fruit were crossed with true-breeding plant that gave long fruit, all the F1 plant were round. These F1 plants were then intercrossed to produce the F2 generation. There were a total of 75 plant in this generation of which 30 produced long fruit. Perform a Chi square to test if these results are consistent with your hypothesis that the shape of the pepper fruit is controlled by one gene. To receive full credit you must answer the following:

a) What is the genotype of the parental plants? (Use whatever letter symbol you want to use.)

b) Which phenotype is the dominant one?

c) What is your Chi square value for this experiment?

d) Is your hypothesis accepted or rejected

In birds, females are the heterogametic sex (ZW) and males are homogametic (ZZ). The feather color gene in pigeons is on the Z chromosome with dominance expressed as red > blue > brown. A female from a true breeding red line is crossed with a male from a true breeding brown line to yield an F1 male. In another cross, a female from a true breeding blue line is crossed with a male from a true breeding brown line to yield an F1 female. The F1 male and F1 female are crossed. What are the genotypes of these two F1 individuals and what are the expected proportions of genotypes and phenotypes (including sex) from the resultant F2 progeny ?

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