Bones tend to become brittle with age. A disease called osteoporosis causes bones to become less dense and as a result, bones break more easily.
Osteoporosis is more common among older women, because they produce less
of a hormone called estrogen, which aids in bone formation. Many doctors
hypothesize that older women who take estrogen supplements will experience
fewer broken bones.
Part A: Describe how an experiment could be designed to test this hypothesis.
Part B: What would be the outcome variable (dependent variable)?
Part C: What would be the test variable (independent variable)?

The answer is b hope this

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.