The wild-type (normal) fruit fly, Drosophila melanogaster, has st...

Question

The wild-type (normal) fruit fly, Drosophila melanogaster, has straight wings and long bristles. Mutant strains have been isolated that have either curled wings or short bristles. The genes representing these two mutant traits are located on separate chromosomes. Carefully examine the data from the following five crosses.

Assign gene symbols and, for each cross, determine the genotypes of the parents.

Accepted Answer

Everyone. Let's take a look at this question together. Black color is dominant in sheep over white. If a test cross on a black sheep with an unknown genotype results in a 1 to 1 ratio, what could be the genotype of the unknown parent? And when we're talking about that 1 to 1 ratio, our results from the offspring looks something like this, where we have that 50 50 split of black and white color cheap. And so to get this result in our punnett square, we know that we have to have one species being that Hamas is recessive. And so that would mean that the unknown genotype to get to this result would have to be a Hetero Zegas genotype, which would make answer choice a the correct answer. Because the hetero ziggy's Jenna type crossed with a Hamas agus recessive gives us that 1 to 1 fanatic ratio because a Hetero zegas parent will produce that 1 to 1 phenotype since 50% will have the dominant trait and 50% will have the recessive trait. So that means that answer choice A is the correct answer. I hope you found this video to be helpful. Thank you and goodbye

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