Sometimes in your house you find a fly with a golden body color. One day you fin

Question

Sometimes in your house you find a fly with a golden body color. One day you find two flies: one male and one female. You decide to cross one with the other and have 48 progeny: 34 golden and 14 normal color.

1- Is golden or normal color dominant?

2- What do you think the genotypes of the parents and their progeny are?

3- What phenotypic ratios would you have expected from your answers to #1 and #2? Perform a chi-squared test of your hypothesis

4- How could you experimentally prove or disprove your answer to #2 by genetic crosses?

5- What would be an explanation for if you found approximately equal amounts of golden and normal progeny after several individual crosses?

Explanation / Answer

1. The Golden color is Dominant because the number of progeny with gold color are higher in number.

2.The genotypes of parents must be Heterozygous Golden color.

3.3:1 of gold to normal body color,

chi-square test : X2 = (O - E)2 / E, since the expected and observed are similar and D.f(degrees of freedom is 1) we can tell that it proves our Null hypothesis.

4.By Performing a Back Cross by crossing the parent with recessive ( Normal body color).

5.Law of independent Assortment is the cause for such cases.

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