With the mapping of the human genome and the development of karyotypes to predict genetic abnormalities, there is a growing need for researchers in the field of

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. 

Homologous chromosomes with heterozygous alleles d) heterozygous chromosomes with homozygous alleles

He say that it is

To determine whether gestational trophoblastic disease is presentgestational trophoblastic disease is abnormal proliferation and then degeneration of the trophoblastic villi. the embryo fails to develop beyond a primitive start. abnormal trophoblast cells must be identified because they are associated with choriocarcinoma, a rapidly metastasizing malignancy. this is why it is important for any woman who begins to miscarry at home to bring any clots or tissue passed to the hospital with her. the presence of clear fluid-filled cysts changes the diagnosis from a simple miscarriage to gestational trophoblastic disease. the client is not instructed to bring in passed tissue to determine whether infection is present or the fetus is viable or to determine the stage of development of the fetus.