Question

In contrast to the round-eyes of wild-type Drosophila, bar-eyed flies have eyes that are shaped like an oval and appear to be squished (figure 1). Another Drosophila phenotype is number of pairs of wings; wild-type flies have a single pair of wings, but bithorax flies have two pairs of wings (figure 2.) A female fly from a pure-breeding stock with bar eyes and single wings was crossed to a pure-breeding male with wild-type eyes and double wings. The male progeny form this cross have bar eyes and single wings, while the female offspring have wild-type eyes and single wings. Figure 1. Drosophila eye shape phenotypes. Wild-type eyes are round in contrast to the oval and misshaped bar-eyed flies Figure 2 Drosophila wing mutant phenotypes. Wild-type flies (top) have a single pair of wings, but bithorax flies (bottom) have two pairs of wings. 1. Based on this information determine the mode of inheritance (autosomal or sex-linked) of each trait. 2. Provide genotypes for the parental files, as well as the male and female progeny using clearly defined allele designations of your choice.

          In contrast to the round-eyes of wild-type Drosophila, bar-eyed flies have eyes that are shaped like an oval and appear to be squished (figure 1). Another Drosophila phenotype is number of pairs of wings; wild-type flies have a single pair of wings, but bithorax flies have two pairs of wings (figure 2.) A female fly from a pure-breeding stock with bar eyes and single wings was crossed to a pure-breeding male with wild-type eyes and double wings. The male progeny form this cross have bar eyes and single wings, while the female offspring have wild-type eyes and single wings.

Figure 1. Drosophila eye shape phenotypes. Wild-type eyes are round in contrast to the oval and misshaped bar-eyed flies

Figure 2 Drosophila wing mutant phenotypes. Wild-type flies (top) have a single pair of wings, but bithorax flies (bottom) have two pairs of wings.

1. Based on this information determine the mode of inheritance (autosomal or sex-linked) of each trait.

2. Provide genotypes for the parental files, as well as the male and female progeny using clearly defined allele designations of your choice.

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In contrast to the round-eyes of wild-type Drosophila, bar-eyed flies have eyes that are shaped like an oval and appear to be squished (figure 1). Another Drosophila phenotype is number of pairs of wings; wild-type flies have a single pair of wings, but bithorax flies have two pairs of wings (figure 2.) A female fly from a pure-breeding stock with bar eyes and single wings was crossed to a pure-breeding male with wild-type eyes and double wings. The male progeny form this cross have bar eyes and single wings, while the female offspring have wild-type eyes and single wings.

Figure 1. Drosophila eye shape phenotypes. Wild-type eyes are round in contrast to the oval and misshaped bar-eyed flies

Figure 2 Drosophila wing mutant phenotypes. Wild-type flies (top) have a single pair of wings, but bithorax flies (bottom) have two pairs of wings.

1. Based on this information determine the mode of inheritance (autosomal or sex-linked) of each trait.

2. Provide genotypes for the parental files, as well as the male and female progeny using clearly defined allele designations of your choice.

Added by Randall A.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

Instant Answer

Solved by Expert Katlin Koehn

06/05/2023

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We have a female with bar eyes and single wings (bar-eyed, single-winged) and a male with wild-type eyes and double wings (wild-type-eyed, double-winged). Show more…

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In contrast to the round-eyes of wild-type Drosophila, bar-eyed flies have eyes that are shaped like an oval and appear to be squished (figure 1). Another Drosophila phenotype is number of pairs of wings; wild-type flies have a single pair of wings, but bithorax flies have two pairs of wings (figure 2.) A female fly from a pure-breeding stock with bar eyes and single wings was crossed to a pure-breeding male with wild-type eyes and double wings. The male progeny form this cross have bar eyes and single wings, while the female offspring have wild-type eyes and single wings. Figure 1. Drosophila eye shape phenotypes. Wild-type eyes are round in contrast to the oval and misshaped bar-eyed flies Figure 2 Drosophila wing mutant phenotypes. Wild-type flies (top) have a single pair of wings, but bithorax flies (bottom) have two pairs of wings. 1. Based on this information determine the mode of inheritance (autosomal or sex-linked) of each trait. 2. Provide genotypes for the parental files, as well as the male and female progeny using clearly defined allele designations of your choice.

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Transcript

00:01 In this particular question we have a cross between two individuals and we are told the phenotypes of both and the phenotypes of their male and female offspring.

00:12 So based on these we are to determine mode of inheritance for both genes.

00:16 So we're going to just start with phenotypes, right? so there's two different ones.

00:21 I'm going to color code them.

00:23 So the first trait that we're looking at, the mom has the mutant type, the dad has the wild type, and then we're told that all of the female offspring have wild and all of the male offspring have mutant type.

00:37 And then for the other trait, the second one, mom has mutant type, dad has wild type, female offspring are mutant and male offspring are mutant.

00:52 And one more piece of information is that both parents are true breeding, meaning that our offspring will get one chromosome from mom, one chromosome from dad, and if dad has wild type, the only allele he can give, the only type of chromosome he can give, is wild.

01:15 Mom, the only type of chromosome she can give is mutant type.

01:20 So based on this determining mode of inheritance, we're going to do these one trait at a time.

01:27 So we're going to start with this first one, the red trait.

01:29 We're going to call it a gene a.

01:31 So mom has a mutant type, dad has wild, and then we see in the offspring female have one type, male have another type...

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