In Drosophila melanogaster, short wings are caused by an allele (Xs ) that is X linked and recessive to an allele for normal wings (X+ ). White eyes are caused by an allele (w) that is autosomal and recessive to an allele for gray eyes (w + ). A female fly that is homozygous for normal wings and gray eyes mates with a male fly that has short wings and white eyes. The F1 are intercrossed to produce the F2. What will the phenotypes and proportions of the F2 flies be from the cross?

(,   , , , , )  =  female with normal wings and gray eyes =

( ,   ) = female with normal wings and white eyes =

(, , ) = male with normal wings and gray eyes =

( , ,   ) = male with short wings and gray eyes

=

( ) = male with normal wings and white eyes =  

() = male with short wings and white eyes  =  

Explanation:

Let the allele for short wings =  

Let the allele for normal wings =

Let the allele for white eye =

Let the allele for gray eye =

A female fly that is homozygous for normal wings and gray eyes mates with a male fly that has short wings and white eyes.

i.e

The offspring are :        &        

Now: if  self-crossed; we have the following gametes for the cross.

,   ,   ,  

On the other hand; if  self-crossed; we have the following.

, , ,

So the  is shown below as follows:

The phenotypes and their proportions are:

(,   , , , , )  =  female with normal wings and gray eyes =

( ,   ) = female with normal wings and white eyes =

(, , ) = male with normal wings and gray eyes =

( , ,   ) = male with short wings and gray eyes

=

( ) = male with normal wings and white eyes =  

() = male with short wings and white eyes  =  

answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation:

the backbone of the dna and rna compound is sugar phosphate.