Genetics problem: Aneuploidy, polyploidy Mendelian ratios are modified in crosse

Question

Genetics problem: Aneuploidy, polyploidy

Mendelian ratios are modified in crosses involving autotetraploids. In an autotetraploid pea species, green seed is governed by the dominant gene I (i.e., I--- plants have yellow seed, while iiii plants have green seed and round seed shape is governed by the dominant gene R (i.e., R--- plants have round seed, while rrrr plants have wrinkled seed. What is the predicted proportion of green round seed in the F2 progeny of a cross involving the two independently assorting characteristics (e.g., IIIIRRRR X iiiirrrr). 1/4 9/16 1/36 1/1296 1225/1296 3/4 3/16 35/36 35/1296 1

Explanation / Answer

The correct answer for this question will be:-

(H) 35/1296.

This is because the proportion of green round seed in the F2 progeny of a dihybrid cross should involve only those independently assorted characteristics which have dominent genes for the green seed and round seeds.

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