3. An individual heterozygous for the following three alleles (XYZ) was testcrossed to a homozygous recessive individual (xyz). The following offspring were generated: XYZ 200 XYZ 210 XYZ 215 Xyz 205 XYZ 80 XYZ, 90 XYZ 85 XYZ 95 M. How many genes are linked? N. Which allele groups are parental? O. What do the other groups represent? P. What are the distances between the linked genes?

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Chapter1: The Human Body: An Orientation
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**Genetic Linkage and Gene Mapping Exercise**

**Problem 3:**

An individual heterozygous for the following three alleles (XYZ) was testcrossed to a homozygous recessive individual (xyz). The following offspring were generated:

- XYZ 200
- xyz 210
- xYz 215
- XyZ 205
- XYz 80
- xYz 90
- Xyz 85
- XyZ 95

**Questions:**

**M. How many genes are linked?**

**N. Which allele groups are parental?**

**O. What do the other groups represent?**

**P. What are the distances between the linked genes?** 

---

**Explanation for Teachers:**

The above data presents a classic testcross where the progeny outcomes can be analyzed to determine linkage and recombination frequencies between alleles. The parental types are typically represented by the largest number of offspring, indicating no recombination, while recombinant types are fewer, indicating crossing over has occurred. By calculating the recombination frequencies, students can estimate the genetic distances between the linked genes. This exercise helps illustrate the principles of genetic linkage and mapping in a straightforward manner.
Transcribed Image Text:**Genetic Linkage and Gene Mapping Exercise** **Problem 3:** An individual heterozygous for the following three alleles (XYZ) was testcrossed to a homozygous recessive individual (xyz). The following offspring were generated: - XYZ 200 - xyz 210 - xYz 215 - XyZ 205 - XYz 80 - xYz 90 - Xyz 85 - XyZ 95 **Questions:** **M. How many genes are linked?** **N. Which allele groups are parental?** **O. What do the other groups represent?** **P. What are the distances between the linked genes?** --- **Explanation for Teachers:** The above data presents a classic testcross where the progeny outcomes can be analyzed to determine linkage and recombination frequencies between alleles. The parental types are typically represented by the largest number of offspring, indicating no recombination, while recombinant types are fewer, indicating crossing over has occurred. By calculating the recombination frequencies, students can estimate the genetic distances between the linked genes. This exercise helps illustrate the principles of genetic linkage and mapping in a straightforward manner.
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