Identify the type of symbiosis described.
The brown-headed cowbirds
lay eggs in otherbirds' nests. They trick the birds
into raising their young. The cowbirds hatch first
and push the eggs out of the nest. The cowbirds
are then fed by the nest-builder.
-vides
arge
DONE
e

Gravitational force i believe

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.