Explain your answer and show work if necessary: A researcher has two strains of

Question

Explain your answer and show work if necessary:

A researcher has two strains of mosquito, one with golden eyes and normal wings, and one with normal eyes and bent wings. Both strains are true-breeding. She crosses these two strains to get an F1, which has both normal eyes and normal wings. When the F1 are crossed with each other, in the resulting F2 she finds the following progeny: 472 normal eyes and wings 138 golden eyes and normal wings 145 normal eyes and bent wings 45 golden eyes and bent wings.

Do these results fit the expectation for two independently assorting genes controlling these two traits?

a) X2=2.7, results consistent with two independently assorting genes

b) X2=2.7, results not consistent with two independently assorting genes

c) X2= 525.0, results consistent with two independently assorting genes

d) X2= 525.0. results not consistent with two independently assorting genes

e) X2>> 10,000, results not consistent with two independently assorting genes   

Explanation / Answer

Consider GG codes normal eyes and gg codes golden eyes.

WW codes normal wings and ww codes bent wings

The cross between the two true bred parents gives the F1 generation with genotyes GgWw. When two F1 progeny are interbred, the following is the result:

The expected and observed genotypes are as follows:

Genotype

Normal eye/Normal wing

Golden eye/Normal wing

Normal eye/bent wing

Golden eye/bent wing

Expected

450

150

150

50

Observed

472

138

145

45

Chi-square calculation:

Genotype

Normal eye/Normal wing

Golden eye/Normal wing

Normal eye/bent wing

Golden eye/bent wing

Expected

450

150

150

50

Observed

472

138

145

45

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