Imagine a dihybrid cross. if there are 100 progeny (we are talking about flies here), approximately how many flies would you expect to be homozygous recessive for both traits?

In a dihybrid cross, the ratio of the offspring is 
9-homozygous dominant for both traits
3-dominant for one trait and recessive for the other) 
3 -dominant for one trait and recessive for the other
1 - homozygous recessive for both traits

Therefore there will be one-sixteenth of homozygous recessive for both traits( 9+3+3+1=16) of a 100 flies in the next generation, or more precisely 6,25.

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait. 

Yes yes yes very good