Question

True breeding red-eyed Drosophila flies with plain thoraxes were crossed with pink eyed flies with striped thoraxes.
Red eye plain thorax $\times$ Pink eye striped thorax
The $F_1$ flies were then crossed against the double recessive
The following $F_2$ generation resulted from the cross:

$80$	$16$	$12$	$92$
Red eye	Red eye	Pink eye	Pink eye
Plain thorax	Striped thorax	Plain thorax	Striped thorax

What percentage number of recombinants resulted from the test cross?

• A. $12$
• B. $14$
• C. $16$
• D. $28$

Answer 1

Answer: (B)

$14$

The total variety found is 80+16+12+92= 200

of which the new variety is 12+16=28

the percentage of the recombinant is (28/200)*100=14

So, the correct answer is '14'