A student studying interactions between body systems constructs this table. The student plans to fill out the table with phrases that describe an interaction between
each pair of systems.
Skeletal Circulatory Muscular Digestive Respiratory Urinary Nervous
Skeletal
Circulatory
Muscular
Digestive
Respiratory
Urinary
Nervous
Which of these phrases could be placed in the position marked with an X?
F Provides nutrients to kidney cells
G Provides nutrients to brain cells
H Provides nutrients to nerve cells
J Provides nutrients to muscle cells

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.