In drosophila, a cross was made between a yellow- bodied male with vestigial (not fully developed) wings and a wild-type female (brown body). the f1 generation consisted of wild-type males and wild-type females. f1 males and females were crossed, and the f2 progeny consisted of 16 yellow-bodied males with vestigial wings, 48 yellow-bodied males with normal wings, 15 males with brown bodies and vestigial wings, 49 wild-type males, 31 brown-bodied females with vestigial wings, and 97 wild-type females. explain the inheritance of the two genes in question based on these results.

The body color gene is sex-linked and the vestigial gene is autosomal.

Explanation:

1st cross)  yellow-bodied male with vestigial wings X wild-type female (brown body)

F1: wild-type males and females

2nd cross) F1 x F1

F2:

16 yellow-bodied males with vestigial wings

48 yellow-bodied males with normal wings

15 males with brown bodies and vestigial wings

49 wild-type males

31 brown-bodied females with vestigial wings

97 wild-type females

Total: 256

Let's analyze the traits (body color and wings) one at a time:

Wing shape

These proportions are similar to 1/4 vestigial, 3/4 normal wings. In addition, males and females have the same amount of individuals with vestigial wings. This suggests that the wing shape gene is autosomal, with the allele vg+ being wild-type and dominant over the vestigial vg allele..

Body color

The ratios are also 1 yellow : 3 brown, but there's a difference between males and females. This suggests that the gene that determines body color is sex-linked.

With this hypothesis, let's do the crosses considering the genotypes:

1) Parents: XʸY vg vg X Xʸ⁺Xʸ⁺ vg+ vg+

F1:  Xʸ⁺Y vg vg+ and Xʸ⁺Xʸ vg vg+  (all wild-type)

2) F1xF1 gives us the offspring predicted in the Punnett Square, which matches the proportions observed in the F2.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.