In the tomato the mutant genes o (oblate = flattened fruit), p (peach = hairy fruit), and s (compound inflorescence = many flowers in a cluster) were found to be linked on chromosome 2. A testcross with a heterozygote was done, yielding the following progeny +++ = 73 ++s = 348 +p+ = 2 +ps = 96 o++ = 110 o+s = 2 op+ = 306 ops = 63 1) The order and arrangement of genes in the heterozygous parent are a. +++ /ops b. ++s/po+ C. +++ / pos d. +++ /sop e. both answers c and d are correct

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### Genetic Linkage in Tomato Plants

In the tomato, mutant genes are represented as follows:
- **o** (oblate = flattened fruit)
- **p** (peach = hairy fruit)
- **s** (compound inflorescence = many flowers in a cluster)

These genes were found to be linked on chromosome 2. A testcross with a heterozygote was conducted, and the progeny results are as follows:

| Genotype | Number of Progeny |
|----------|-------------------|
| + + +    | 73                |
| + + s    | 348               |
| + p +    | 2                 |
| + p s    | 96                |
| o + +    | 110               |
| o + s    | 2                 |
| o p +    | 5                 |
| o p s    | 306               |
| ops      | 63                |

### Questions

1. **The order and arrangement of genes in the heterozygous parent are:**
   - a. + + + / ops
   - b. + + s / po+
   - c. + + + / pos
   - d. + + s / sop
   - e. **Both answers c and d are correct**

2. **The correct map of these three loci is:**
   - a. p - 21cM - o - 14cM - s
   - b. s - 14cM - o - 21 cM - p
   - c. s - 35.4cM - o - 14 cM - p
   - d. o - 14cM - p - 21cM - s
   - e. **Both choices a and b are correct**

3. **The single o-p crossover class is exhibited by the following offspring:**
   - a. ++s = 348; o+p = 306
   - b. +p+ = 96; o++ = 110
   - c. ops = 63; +++ = 73
   - d. o+s = 2; +p+ = 2
   - e. **The correct class is not provided as a choice.**

### Explanation

This exercise helps to determine the arrangement and relative distance between the linked genes on chromosome 2 of the tomato
Transcribed Image Text:### Genetic Linkage in Tomato Plants In the tomato, mutant genes are represented as follows: - **o** (oblate = flattened fruit) - **p** (peach = hairy fruit) - **s** (compound inflorescence = many flowers in a cluster) These genes were found to be linked on chromosome 2. A testcross with a heterozygote was conducted, and the progeny results are as follows: | Genotype | Number of Progeny | |----------|-------------------| | + + + | 73 | | + + s | 348 | | + p + | 2 | | + p s | 96 | | o + + | 110 | | o + s | 2 | | o p + | 5 | | o p s | 306 | | ops | 63 | ### Questions 1. **The order and arrangement of genes in the heterozygous parent are:** - a. + + + / ops - b. + + s / po+ - c. + + + / pos - d. + + s / sop - e. **Both answers c and d are correct** 2. **The correct map of these three loci is:** - a. p - 21cM - o - 14cM - s - b. s - 14cM - o - 21 cM - p - c. s - 35.4cM - o - 14 cM - p - d. o - 14cM - p - 21cM - s - e. **Both choices a and b are correct** 3. **The single o-p crossover class is exhibited by the following offspring:** - a. ++s = 348; o+p = 306 - b. +p+ = 96; o++ = 110 - c. ops = 63; +++ = 73 - d. o+s = 2; +p+ = 2 - e. **The correct class is not provided as a choice.** ### Explanation This exercise helps to determine the arrangement and relative distance between the linked genes on chromosome 2 of the tomato
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