Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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In a newly discovered species of Giant Pacific Octopus, long tentacles (L) are dominant to short tentacles (l), strong suction cups (S) are dominant to weak suction cups (s), and brown body color (B) is dominant to red body color (b). A trihybrid test cross was performed between male octopuses that were heterozygous for all three genes, and female octopuses that were homozygous recessive. (You may assume that the dominant alleles exhibit complete dominance.) The results of this cross are shown in the table attached
Please complete the tabel and answer the followig questions:
a) If the three genes are linked, draw a diagram that shows the correct orderof the three genes on the chromosome (with respect to which gene is in the middle) and also LABEL Region I and Region II on your diagram.
b) Calculate the map distances between each of the three genes. Please show the formula used for each calculation, and show ALL calculations. Define which region is your region I and which region is your region II. (For example, please state the region I is between genes x and y, and region II is between genes y and z.)
Transcribed Image Text:### Genetic Phenotype Frequency Table
This table presents data on various genetic phenotypes observed in an organism, along with the number of occurrences for each phenotype. Additionally, the table is designed to include information on the genotype of each phenotype, written in the linkage phase format, as well as its classification (P, SCO I, SCO II, or DCO). However, the genotype and classification columns are not yet filled in.
#### Table: Phenotype Frequencies and Genotypes
| **Phenotype** | **Number** | **Genotype (Written in linkage phase format) (xyz/xyz)** | **P, SCO I, SCO II, or DCO?** |
|----------------------------|------------|---------------------------------------------------------|--------------------------------|
| Long, weak, brown | 292 | | |
| Long, strong, brown | 153 | | |
| Short, strong, red | 286 | | |
| Short, weak, red | 139 | | |
| Long, strong, red | 42 | | |
| Long, weak, red | 16 | | |
| Short, weak, brown | 46 | | |
| Short, strong, brown | 12 | | |
| **TOTAL** | **986** | | |
### Explanation:
- **Phenotype**: Describes the observable characteristics of the organism.
- **Number**: Indicates the count of individuals displaying each phenotype.
- **Genotype (Written in linkage phase format) (xyz/xyz)**: This column is intended to specify the genetic makeup of the phenotype in linkage phase format (to be filled).
- **P, SCO I, SCO II, or DCO?**: This column is intended to classify the phenotypes. P stands for Parental type, SCO I for single crossover in region I, SCO II for single crossover in region II, and DCO for double crossover (to be filled).
This data can be used to analyze genetic linkage and crossover frequencies in genetic studies.
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