Question: A second trihybrid test cross was performed involving female octopus that were heterozygous for all three genes and male octopus that were homozygous recessive.The results of this second cross are shown in the table below. Offer a plausible explanation for the differences observed between the results of trihybrid test cross #1 vs. the results of this second test cross.   Phenotype Number observed Long, weak, brown 495 Short, strong, red 501

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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

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A second trihybrid test cross was performed involving female octopus that were heterozygous for all three genes and male octopus that were homozygous recessive.The results of this second cross are shown in the table below. Offer a plausible explanation for the differences observed between the results of trihybrid test cross #1 vs. the results of this second test cross.  

Phenotype

Number observed

Long, weak, brown

495

Short, strong, red

501

 

### Phenotypic Analysis of Gene Linkage

The following table details phenotypic frequencies in a genetic linkage study. The phenotypes observed, their respective quantities, and associated genotypes written in linkage phase format are summarized. Additionally, the nature of recombination is to be determined (P, SCO I, SCO II, or DCO).

| 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 of Terms
- **Phenotype**: Observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.
- **Number**: Quantity of individuals exhibiting a given phenotype.
- **Genotype**: The genetic constitution of an individual organism. Here, it is represented in a format indicating linkage phases of multiple genes.
- **Recombination Types**:
  - **P**: Parental
  - **SCO I**: Single crossover type I
  - **SCO II**: Single crossover type II
  - **DCO**: Double crossover 

This table facilitates the study of linkage and recombination in genetics by showing the distribution of phenotypic traits within a given population. The genotypic data, once filled, will permit the determination of whether the observed phenotypes are results of parental inheritance or recombination events.
Transcribed Image Text:### Phenotypic Analysis of Gene Linkage The following table details phenotypic frequencies in a genetic linkage study. The phenotypes observed, their respective quantities, and associated genotypes written in linkage phase format are summarized. Additionally, the nature of recombination is to be determined (P, SCO I, SCO II, or DCO). | 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 of Terms - **Phenotype**: Observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences. - **Number**: Quantity of individuals exhibiting a given phenotype. - **Genotype**: The genetic constitution of an individual organism. Here, it is represented in a format indicating linkage phases of multiple genes. - **Recombination Types**: - **P**: Parental - **SCO I**: Single crossover type I - **SCO II**: Single crossover type II - **DCO**: Double crossover This table facilitates the study of linkage and recombination in genetics by showing the distribution of phenotypic traits within a given population. The genotypic data, once filled, will permit the determination of whether the observed phenotypes are results of parental inheritance or recombination events.
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