Consider the data in the following table, derived from crossing a female fruit fly that was heterozygous for the sex-linked recessive loci, cut wings (ct), raspberry eyes (ra), and forked (f) bristles, with a wild-type male. Female progeny were all wild- type. Male progeny are listed below. Phenotype ct ra f + + + ct + ra ct + + + f ct ra + ra + + f olololol + + f Number of males ct ra f ra ct f 70 76 74 356 345 3 72 4 Total What is the order of the three genes? 1,000 ct f ra Cannot be determined from the data
Consider the data in the following table, derived from crossing a female fruit fly that was heterozygous for the sex-linked recessive loci, cut wings (ct), raspberry eyes (ra), and forked (f) bristles, with a wild-type male. Female progeny were all wild- type. Male progeny are listed below. Phenotype ct ra f + + + ct + ra ct + + + f ct ra + ra + + f olololol + + f Number of males ct ra f ra ct f 70 76 74 356 345 3 72 4 Total What is the order of the three genes? 1,000 ct f ra Cannot be determined from the data
Human Anatomy & Physiology (11th Edition)
11th Edition
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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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:### Genetic Cross Data Analysis
**Background Information:**
Consider the data in the following table, derived from crossing a female fruit fly that was heterozygous for the sex-linked recessive loci: cut wings (ct), raspberry eyes (ra), and forked (f) bristles, with a wild-type male. Female progeny were all wild-type. Male progeny are listed below.
| **Phenotype** | **Number of males** |
|---------------|---------------------|
| ct ra f | 70 |
| + ra f | 76 |
| + + + | 74 |
| ct + f | 356 |
| + ra + | 345 |
| ct ra + | 3 |
| ct + + | 72 |
| + + f | 4 |
**Total**: 1,000
**Question:**
What is the order of the three genes?
- ☐ ct ra f
- ☐ ra ct f
- ☐ ct f ra
- ☐ Cannot be determined from the data
**Analysis:**
This table presents the results of a genetic cross involving three traits in fruit flies: cut wings (ct), raspberry eyes (ra), and forked bristles (f). The data shows the distribution of phenotypes in the male progeny, helping determine the order of genes on a chromosome through recombination frequencies. Based on this, the correct order can be inferred by comparing observed recombination events with expected ones for different gene orders.
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