The striped silkworm breed is crossed with the monochromatic caterpillar breed. The F1 hybrid tracks were striped

| March 3, 2021 | education

The striped silkworm breed is crossed with the monochromatic caterpillar breed. The F1 hybrid tracks were striped. In F2, we got about 1200 striped and 400 monochrome. A) How many different genotypes are there among F2 striped caterpillars? B) How many homozygous caterpillars are there in F2? Q) How many different phenotypes will result from crossing an F1 hybrid with a breed that has monochromatic caterpillars? D) How many different phenotypes are there in F2? E) How many different genotypes are there in F2?

AA * aa

gametes: A a

F1: Aa (striped)

Aa * Aa

gametes: A a; A a

F2: AA, Aa, Aa, aa

In the second generation, three different genotypes and two phenotypes are distinguished, of which 400 caterpillars were homozygous monochromatic, 400 were homozygous striped.

When crossing a hybrid of the first generation with monochromatic caterpillars, offspring with two Aa phenotypes (striped) are obtained; aa (monochrome).



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