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
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
Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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
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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