In Drosophila, gray body color is dominant to ebony body color, w...

Question

In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P₁ individuals are homozygous, work the following crosses through the F₂ generation, and determine the genotypic and phenotypic ratios for each generation.

gray, long x ebony, vestigial

Accepted Answer

Hey everyone, let's take a look at this question. Together. If yellow and round seed is dominant over green and wrinkle seed, the following are possible gina types of yellow and round seeds except which, so we know that since yellow and round seeds are dominant, the yellow, we can give the capital G. And the round, we give the capital W. And since the green and wrinkled are your recessive traits, we can give the green a little G. And the wrinkled, a little W. And so looking at just the color or yellow versus green, we could have three different possible genotype. So we could have, our home is I guess dominant, our hetero sickness and our home Aziz recessive. And then the same thing for round versus wrinkled. We could have that home Aziz dominant Hetero zegas as well as home aside this recessive. And so when we're looking at possible gino types of yellow and round, that would have to be where we either have a homesickness dominant or a hetero ziggy's for both. So it would be any combination of these four, which leaves these two to be the recessive genotype sis. So if you have a little G. Little G. Or a little W. Little W. Present, you will not have a yellow or round seed exclusively. So looking at our answers, we could see a B and C all have that yellow color as well as that round seed shape because here we have yellow which is dominant as well as round which is dominant. And so looking at answer choice D. We can see, we do have that yellow seed, but because this is recessive, we actually end up with the wrinkled seed instead of the round seed. So answer choice D. Is the only one here that is not a possible genotype of yellow and round together. I hope you found this video to be helpful. Thank you and goodbye.

Key Concepts

Mendelian Genetics

Punnett Square

Genotypic and Phenotypic Ratios

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