A researcher is interested in whether male killifish with bright colors have fav

Question

A researcher is interested in whether male killifish with bright colors have favorable alleles, in various parts of their genome unrelated to color pattern, that fight off disease. He captures thirty males in the act of copulating with females, ten in each of three categories, and collects sperm. The three categories are BRIGHTEST COLORS, MEDIUM COLOR, KINDA DULL COLOR. Next, he fertilizes killifish eggs, all from the same female, in batches, with sperm from each of these male fish. The offspring are raised to adulthood, and exposed to an aquarium parasite, ich.

a)     Imagine the researcher got the following data.

Offspring of Bright Color males, average survivorship; 83% +/- 8% Std error

Offspring of Medium Color males, average survivorship; 61% +/- 11% Std error

Offspring of Kinda Dull Color males, average survivorship, 31% +/- 16% Std error

Question: Might it be a good idea to repeat this experiment with the eggs of another female? Explain?

Explanation / Answer

Ans.) No, it is not needed to repeat this experiment with the eggs of another female. As it is evident from the given data that the bright color has dominant and dull color has recessive alleles. The male progeny exhibit their father’s dominant allele of bright color. Additionally, killfish females are colorless; hence repeating this experiment might not change the outcome. Consequently, male progeny with bright color male has dominant alleles and dull color progeny have recessive type allele.

Moreover, the bright color and medium colored killfishes are obviously more preferential than the dull color males (because of its recessive character). Generally, in nature also the bright and dark colored species always has more potential to survive then the lighter one.

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