True-breeding flies with red eyes and long wings were crossed to flies with white eyes and miniature wings. all f1 offspring had red eyes and long wings. the f1 female flies were then crossed to males with white eyes and miniature wings. the following 400 offspring were obtained for the f2 generation:

The question is incomplete. Complete question is as follows :

What is/are the phenotype(s) of the recombinant offspring of the F2 generation?

Parental generation: True-breeding flies with red eyes and long wings were crossed to flies with white eyes and miniature wings. All F1 offspring had red eyes and long wings.

The F1 female flies were then crossed to males with white eyes and miniature wings. The following results were obtained for the F2 generation:

129 red eyes, long wings

133 white eyes, miniature wings

71 red eyes, miniature wings

67 white eyes, long wings

Red eyes, miniature wings and white eyes, long wings

Explanation:

In absence of linkage parental and recombinant offspring are produced in equal number. When there is linkage crossover does not take place in expected frequency so recombinants are produced in lesser number than parental type offspring.

Here in F2 generation red eyes, miniature wings and white eyes, long wings are produced in lesser number (71 and 67). Also the original parents had red eyes, long wings and white eyes, miniature wings. Hence, Red eyes, miniature wings and white eyes, long wings are the phenotype of the recombinant offspring of the F2 generation.

true is the answer : )

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