Question

In maize, a dominant allele A is necessary for seed color as opposed to colorless a....

In maize, a dominant allele A is necessary for seed color as opposed to colorless a. Another gene has a recessive allele wx that results in waxy starch, as opposed to normal starch Wx. The two genes segregate independently. A true breed colorless, normal starch plant was crossed with a true breed colored, waxy plant. The offspring of that cross were selfed to produce an F2 generation.

a. Give the genotypes and phenotypes (and ratios) of the P, F1, and F2 generations.

b. If the observed phenotypes for the F2 were 96 colored, normal; 25 colored, waxy; 33 colorless, normal; and 6 colorless, waxy, do those fit what you expected from part a above?

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Answer #1

a. The allele 'A' is dominant allele which has a colored seed and 'a' allele is recessive and has colorless seed. The Wx allele is dominant with normal starch phenotype and wx is recessive with waxy starch phenotype. Hence the parents will be having the genotypes:

Colourless, normal starch phenotype - aaWxWx

Colored, waxty starch phenotype - AAwxwx

F1 generation genotype - AaWxwx - colored, normal starch phenotype

F2 generation will be having - 9 Colored, normal starch phenotype ; 3Colored, waxy starch phenotype; 3 Colorless, normal starch phenotype and 1 colorless, waxy starch phenotype.

2. The expected frequency is almost fitting the observed frequency as 90 colored, normal starch, 30 colorless, normal starch, 30 colored, waxy starch and 10 colorless, waxy starch were expected. Observed is close to the expected values.

If you have any query kindly comment before giving thumbs up. Thank you.

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