A researcher performed an analysis of the elemental composition of several fish species living in the same body of water. The amount (in parts per million) of iron (Fe), calcium (Ca), potassium (K), sodium (Na), and magnesium (Mg) found in each species is shown in the table. SpeciesFeCaKNaMg
Species A55.70179.51107.9445.3933.89
Species B23.74134.16105.1945.1033.38
Species C67.18785.18103.6042.7132.45
Species D30.09457.59107.9744.6833.84
Based on this data, identify which elements are found in similar concentrations across all species of fish tested. Explain how this data provides support for the hypothesis that all four species of fish descended from a common ancestor.

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The correct answer is b

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.