A hypothetical population of 200 cats has two alleles, tl and ts, for a locus that codes for tail length. the table below describes the phenotypes of cats with each possible genotype, as well as the number of individuals in the population with each genotype. which statements about the population are true?
Question: A hypothetical population of 200 cats has two alleles, tl and ts, for a locus that codes for tail length. the table below describes the phenotypes of cats with each possible genotype, as well as the number of individuals in the population with each genotype. which statements about the population are true?
| Genotype | Phenotype | Number of individuals |
|---|---|---|
| TL TL | Long tail | 100 |
| TL TS | Medium tail | 80 |
| TS TS | Short tail | 20 |
Statements about the population that are true:
- The population is not in Hardy-Weinberg equilibrium.
- The frequency of the TL allele is 0.65.
- The frequency of the TS allele is 0.35.
- The expected number of cats with the TL TL genotype is 130.
- The expected number of cats with the TS TS genotype is 45.
- The observed number of cats with the TL TL genotype is 100, which is less than the expected number.
- The observed number of cats with the TS TS genotype is 20, which is more than the expected number.
Explanation:
The Hardy-Weinberg principle states that the allele frequencies in a population will remain constant from generation to generation if the following conditions are met:
- The population is large.
- The population is isolated from other populations.
- There is no mutation or selection.
- Mating is random.
If any of these conditions are not met, the population is not in Hardy-Weinberg equilibrium.
In the population of cats described in the table, the TL allele is more common than the TS allele (0.65 vs. 0.35). However, there are fewer cats with the TL TL genotype than expected, and more cats with the TS TS genotype than expected. This suggests that the population is not in Hardy-Weinberg equilibrium.
One possible explanation for this is that selection is occurring against the TL TL genotype. For example, if cats with long tails are more likely to be preyed upon by predators, then they will be less likely to survive and reproduce. This will lead to a decrease in the frequency of the TL TL genotype in the population over time.
Another possible explanation is that the population is not isolated from other populations. If cats with long tails are more likely to migrate to other populations, then this will also lead to a decrease in the frequency of the TL TL genotype in the population over time.
Overall, the data suggests that the population of cats described in the table is not in Hardy-Weinberg equilibrium. This could be due to selection, migration, or some other factor.
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