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Sagot :
To determine the genotype of the female in the given Punnett square, let's analyze the provided information step-by-step.
### Step-by-Step Analysis
1. Interpret the Punnett Square:
The Punnett square shows the combinations of alleles from the male and female gametes.
```
| | T | t |
| t | Tt| tt|
| t | Tt| tt|
```
The rows represent the alleles contributed by the female (ova), and the columns represent the alleles contributed by the male.
2. Determine the Female's Possible Genotypes:
By looking at the offspring combinations, we can identify the alleles contributed by the female:
- Each cell in the Punnett square is a combination of male and female alleles.
- The offspring in the first column of the second and third row are `Tt`.
- The offspring in the second column of the second and third row are `tt`.
3. Identify the Required Alleles for the Offspring:
Here are the combinations seen among the offspring:
- `Tt` and `tt`
These combinations show that the female must have contributed a `t` allele.
4. Determine the Male Alleles:
- The offspring `Tt` indicates that one parent contributed a `T` and the other a `t`.
- The offspring `tt` indicates that both parents contributed a `t`.
5. Infer the Genotype of the Male:
- Since the male contributes `T` and `t` (as observed in the columns), his genotype must be `Tt`.
6. Infer the Genotype of the Female:
- The female must provide `t` for both offspring combinations.
- For the `Tt` offspring, it means the female's contribution is `t` and the male's `T`.
- For the `tt` offspring, both contributions are `t`.
Therefore, the female's genotype must have only `t` alleles—that is, `tt`.
7. Check Against the Given Options:
We have identified that the female could not contribute any `T`, only `t`. Thus:
- `tt` is correct.
- `TT` is incorrect.
- `homozygous` is simply another term for having two identical alleles. Since `tt` is homozygous recessive, this can apply if explicitly asked about homozygous.
- `Tt` is incorrect as it indicates one `T`.
- `heterozygous` (which means one dominant and one recessive allele) is not correct for the female since she does not have a `T`.
### Conclusion
The correct answer, identifying the female genotype based on the Punnett square, is:
- [tex]\( tt \)[/tex] (corresponding to index 0)
- Because `tt` is homozygous, if it was explicitly about `homozygous recessive` only
Thus, the selected answers will be those indicating the female genotype matches these conditions:
1. `tt`
2. Additional notes about `homozygous` would be a match if viewed as explicitly recessive, but not primary.
Only these conditions fully satisfy the provided information.
### Step-by-Step Analysis
1. Interpret the Punnett Square:
The Punnett square shows the combinations of alleles from the male and female gametes.
```
| | T | t |
| t | Tt| tt|
| t | Tt| tt|
```
The rows represent the alleles contributed by the female (ova), and the columns represent the alleles contributed by the male.
2. Determine the Female's Possible Genotypes:
By looking at the offspring combinations, we can identify the alleles contributed by the female:
- Each cell in the Punnett square is a combination of male and female alleles.
- The offspring in the first column of the second and third row are `Tt`.
- The offspring in the second column of the second and third row are `tt`.
3. Identify the Required Alleles for the Offspring:
Here are the combinations seen among the offspring:
- `Tt` and `tt`
These combinations show that the female must have contributed a `t` allele.
4. Determine the Male Alleles:
- The offspring `Tt` indicates that one parent contributed a `T` and the other a `t`.
- The offspring `tt` indicates that both parents contributed a `t`.
5. Infer the Genotype of the Male:
- Since the male contributes `T` and `t` (as observed in the columns), his genotype must be `Tt`.
6. Infer the Genotype of the Female:
- The female must provide `t` for both offspring combinations.
- For the `Tt` offspring, it means the female's contribution is `t` and the male's `T`.
- For the `tt` offspring, both contributions are `t`.
Therefore, the female's genotype must have only `t` alleles—that is, `tt`.
7. Check Against the Given Options:
We have identified that the female could not contribute any `T`, only `t`. Thus:
- `tt` is correct.
- `TT` is incorrect.
- `homozygous` is simply another term for having two identical alleles. Since `tt` is homozygous recessive, this can apply if explicitly asked about homozygous.
- `Tt` is incorrect as it indicates one `T`.
- `heterozygous` (which means one dominant and one recessive allele) is not correct for the female since she does not have a `T`.
### Conclusion
The correct answer, identifying the female genotype based on the Punnett square, is:
- [tex]\( tt \)[/tex] (corresponding to index 0)
- Because `tt` is homozygous, if it was explicitly about `homozygous recessive` only
Thus, the selected answers will be those indicating the female genotype matches these conditions:
1. `tt`
2. Additional notes about `homozygous` would be a match if viewed as explicitly recessive, but not primary.
Only these conditions fully satisfy the provided information.
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