7.18 In Drosophila, the genes st (scarlet eyes), ss (spineless bris- tles), and e (ebony body) are located on chromosome 3, with map positions as indicated: SS e 58 70 st 44 Each of these mutations is recessive to its wild-type allele (st, dark red eyes; sst, smooth bristles; et, gray body). Phenotypically wild-type females with the genotype st ss et/st st sste were crossed with triply recessive males. Predict the phenotypes of the progeny and the frequen- cies with which they will occur assuming (a) no interfer- ence and (b) complete interference.
7.18 In Drosophila, the genes st (scarlet eyes), ss (spineless bris- tles), and e (ebony body) are located on chromosome 3, with map positions as indicated: SS e 58 70 st 44 Each of these mutations is recessive to its wild-type allele (st, dark red eyes; sst, smooth bristles; et, gray body). Phenotypically wild-type females with the genotype st ss et/st st sste were crossed with triply recessive males. Predict the phenotypes of the progeny and the frequen- cies with which they will occur assuming (a) no interfer- ence and (b) complete interference.
Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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![**7.18 In *Drosophila*, the genes st (scarlet eyes), ss (spineless bristles), and e (ebony body) are located on chromosome 3, with map positions as indicated:**
\[
\begin{array}{ccc}
\text{st} & \text{ss} & \text{e} \\
44 & 58 & 70 \\
\end{array}
\]
Each of these mutations is recessive to its wild-type allele (st⁺, dark red eyes; ss⁺, smooth bristles; e⁺, gray body). Phenotypically wild-type females with the genotype st ss e⁺/st⁺ ss⁺ e were crossed with triply recessive males. Predict the phenotypes of the progeny and the frequencies with which they will occur assuming (a) no interference and (b) complete interference.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb0055c40-4928-4abd-b338-a4750e8e1e8c%2Fe1b67879-a2dd-469c-a397-181e88744b08%2F4v7wz2d_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**7.18 In *Drosophila*, the genes st (scarlet eyes), ss (spineless bristles), and e (ebony body) are located on chromosome 3, with map positions as indicated:**
\[
\begin{array}{ccc}
\text{st} & \text{ss} & \text{e} \\
44 & 58 & 70 \\
\end{array}
\]
Each of these mutations is recessive to its wild-type allele (st⁺, dark red eyes; ss⁺, smooth bristles; e⁺, gray body). Phenotypically wild-type females with the genotype st ss e⁺/st⁺ ss⁺ e were crossed with triply recessive males. Predict the phenotypes of the progeny and the frequencies with which they will occur assuming (a) no interference and (b) complete interference.
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