Question

A species of fly can either have the dominant trait of red eyes, or the recessive trait of brown eyes. If one heterozygous fly mates with a brown eyed fly, what percentage of the offspring would you expect to have

Answer 1

The correct answer would be -

50% heterozygous red flies and 50% recessive brown eyes flies in offspring

Step-by-step explanation:

This is given that a species of fly has two traits for the eye red eye which is the dominant trait and can be represented by R and the brown eyes trait which is recessive and represented by r.

Given: heterozygous fly which means have both traits gene but as Red is dominant it will have red eyes mates with recessive brown eye fly.

Rr × rr

gametes: R, r and r, r

then,

R r

r Rr rr

r Rr rr

There is 50 % recessive brown eyes flies in offspring and 50% heterozygous red eys offspring.