Afemale drosophila with the mutant phenotype a is crossed to a male who has the mutant phenotype b. in the resulting f1 generation all females are wild-type and all males have the a mutant phenotype. based on these results, we can conclude that the mode of inheritance of the phenotype of interest is:

a) autosomal for a and x-linked for b
b) dominant for a and recessive for b
c) recessive for a and dominant for b
d) recessive for both a and b
e) x-linked for a and autosomal for b

The correct answer is option D.

Explanation:

This is an illustration of X-linked recessive inheritance. This is a result of the mutation of genes on X-chromosomes. As females carry two X chromosomes, one from each parent, there is less chance for a female to carry mutant copies on both the X-chromosomes.  

As males possess only one X-chromosomes, obtained from the female parent, one changed gene is adequate to result in a mutant phenotype. All the males exhibit a mutant phenotype as the male parent cannot transfer the X-linked traits to the progeny.  

before it leaves the nucleus of a eukaryotic cell, mrna is altered in the following ways: - a cap is added to the 5' end of the mrna molecule; - a poly a tail is added to the 3' end; - introns are removed and exons are spliced together.

tissue

explanation:

it is actually formed by geoup of cells which is tissue