Answer :
Sure, let's break this down step-by-step.
### First Cross: Heterozygous Male (Ww) and Homozygous Recessive Female (ww)
1. Parent Genotypes:
- Male: Ww
- Female: ww
2. Determine Possible Offspring Genotypes:
- Using a Punnett square, you match each allele from the male with each allele from the female.
```
| w | w |
--------------
W | Ww | Ww |
w | ww | ww |
```
3. Results of the Punnett Square:
- There are two possible offspring genotypes from this cross: Ww and ww.
- Ww appears in two out of the four squares.
- Therefore, 50% of the offspring will be heterozygous (Ww).
### Second Cross: Heterozygous (Ww) and Homozygous Dominant (WW)
1. Parent Genotypes:
- Parent 1: Ww
- Parent 2: WW
2. Determine Possible Offspring Genotypes:
- Again, use a Punnett square to find the combination of alleles from each parent.
```
| W | W |
--------------
W | WW | WW |
w | Ww | Ww |
```
3. Results of the Punnett Square:
- Possible genotypes from this cross are WW or Ww.
- None of the offspring will be homozygous recessive (ww) since neither parent provides a recessive allele to form a homozygous recessive genotype.
So, summarizing the answers:
- In the first cross, 50% of the offspring will be heterozygous (Ww).
- In the second cross, there is a 0% probability of having a homozygous recessive (ww) offspring.
### First Cross: Heterozygous Male (Ww) and Homozygous Recessive Female (ww)
1. Parent Genotypes:
- Male: Ww
- Female: ww
2. Determine Possible Offspring Genotypes:
- Using a Punnett square, you match each allele from the male with each allele from the female.
```
| w | w |
--------------
W | Ww | Ww |
w | ww | ww |
```
3. Results of the Punnett Square:
- There are two possible offspring genotypes from this cross: Ww and ww.
- Ww appears in two out of the four squares.
- Therefore, 50% of the offspring will be heterozygous (Ww).
### Second Cross: Heterozygous (Ww) and Homozygous Dominant (WW)
1. Parent Genotypes:
- Parent 1: Ww
- Parent 2: WW
2. Determine Possible Offspring Genotypes:
- Again, use a Punnett square to find the combination of alleles from each parent.
```
| W | W |
--------------
W | WW | WW |
w | Ww | Ww |
```
3. Results of the Punnett Square:
- Possible genotypes from this cross are WW or Ww.
- None of the offspring will be homozygous recessive (ww) since neither parent provides a recessive allele to form a homozygous recessive genotype.
So, summarizing the answers:
- In the first cross, 50% of the offspring will be heterozygous (Ww).
- In the second cross, there is a 0% probability of having a homozygous recessive (ww) offspring.