Miniature wings in drosophila are due to an x-linked allele (xm) that is recessive to the wild-type allele for normal long wings (x+). brown eyes are produced by an autosomal allele (bw) which is recessive to the wild-type allele for red eyes (bw+). a female that is homozygous for normal wings and has brown eyes is crossed with a male that has miniature wings and is homozygous for red eyes. the f1 offspring are intercrossed to produce the f2 generation. what proportion of the f2 males are expected to have miniature wings and brown eyes?

1/16

Explanation:

Given,

X+, Xm = X linked

bw+ , bw = autosomal

Female parent : X+X+bwbw ( normal wings and brown eyes )

Male parent : XmYbw+bw+ ( miniature wings and red eyes )

When    X+X+bwbw     X      XmYbw+bw+ :

F1 females are X+Xmbw+bw ( normal wings, red eyes )

F1 males are X+Ybw+bw ( normal wings, red eyes )

When    X+Xmbw+bw   X      X+Ybw+bw :

Out of the total progeny 1/2 will be males. Out of them 1/2 will have miniature wings. Out of them 1/4 will have brown eyes.

So, proportion of F2 males with miniature wings and brown eyes will be:

1/2 X 1/2 X 1/4 = 1/16

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.