The fiber tracts indicated by the letter d will terminate in the several examples of ascending spinal cord tracts. the fiber tracts indicated by the letter d will terminate in the several examples of ascending spinal cord tracts. primary somatosensory cortex thalamus cerebral nuclei primary motor cortex

The fiber tracts indicated by the letter d will terminate in the thalamus. The spinal cord has white matter that is separated into dorsal and ventral columns. Often times they are referred to as funiculi and they are made of axons that are going up(ascending) or down (descending) the spinal cord.

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.