10 m.u. In silk moths red eyes (r) and white banded wing (w) are recessive to normal eyes (R) and normal wings (W). A moth homozygous for red eyes and white banded wings is crossed with an individual who is homozygous normal for both traits. The F, progeny are testcrossed with the following progeny produced: Normal eyes, normal wings Red eyes, normal wings 19 Normal eyes, white banded wings Red eyes, white banded wings 426 a. What phenotypic proportions would be expected if the genes for red eyes and white banded wings were located on different chromosomes? b. What is the genetic distance between these two genes? 418 16

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### Genetic Linkage in Silk Moths

In silk moths, red eyes (r) and white banded wings (w) are recessive to normal eyes (R) and normal wings (W). A moth homozygous for red eyes and white banded wings is crossed with an individual who is homozygous normal for both traits. The F₁ progeny are testcrossed with the following progeny produced:

- **Normal eyes, normal wings:** 418
- **Red eyes, normal wings:** 19
- **Normal eyes, white banded wings:** 16
- **Red eyes, white banded wings:** 426

#### Illustrative Explanation

The chart above shows the phenotypic results of a genetic cross in silk moths. It demonstrates the distribution of traits in the offspring after a test cross between F₁ progeny. The significant numbers of moths with parental phenotypes suggest linkage between the genes for eye color and wing pattern.

#### Questions for Further Study

a. **What phenotypic proportions would be expected if the genes for red eyes and white banded wings were located on different chromosomes?**

b. **What is the genetic distance between these two genes?**

These questions encourage exploration of genetic recombination and chromosomal distribution, providing a practical application of Mendelian genetics principles.
Transcribed Image Text:### Genetic Linkage in Silk Moths In silk moths, red eyes (r) and white banded wings (w) are recessive to normal eyes (R) and normal wings (W). A moth homozygous for red eyes and white banded wings is crossed with an individual who is homozygous normal for both traits. The F₁ progeny are testcrossed with the following progeny produced: - **Normal eyes, normal wings:** 418 - **Red eyes, normal wings:** 19 - **Normal eyes, white banded wings:** 16 - **Red eyes, white banded wings:** 426 #### Illustrative Explanation The chart above shows the phenotypic results of a genetic cross in silk moths. It demonstrates the distribution of traits in the offspring after a test cross between F₁ progeny. The significant numbers of moths with parental phenotypes suggest linkage between the genes for eye color and wing pattern. #### Questions for Further Study a. **What phenotypic proportions would be expected if the genes for red eyes and white banded wings were located on different chromosomes?** b. **What is the genetic distance between these two genes?** These questions encourage exploration of genetic recombination and chromosomal distribution, providing a practical application of Mendelian genetics principles.
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