Answer :
Let's solve the question step-by-step.
### Part 1: Crossing a Heterozygous Male (Ww) with a Homozygous Recessive Female (ww)
1. Identify Parent Genotypes:
- Male: Ww (heterozygous)
- Female: ww (homozygous recessive)
2. Create Possible Offspring Genotypes:
- The male can pass on either the W or w allele.
- The female can only pass on the w allele.
3. Determine Offspring Genotypes:
- When the male gives the W allele and the female gives the w allele, the offspring is Ww.
- When both give the w allele, the offspring is ww.
4. Calculate Probabilities:
- There's a 50% chance of having a Ww offspring.
- There's a 50% chance of having a ww offspring.
This results in:
- 50% probability for Ww offspring
- 50% probability for ww offspring
### Part 2: Crossing a Heterozygous Individual (Ww) with a Homozygous Dominant Individual (WW)
1. Identify Parent Genotypes:
- One parent: Ww (heterozygous)
- Other parent: WW (homozygous dominant)
2. Create Possible Offspring Genotypes:
- The Ww parent can pass on either the W or w allele.
- The WW parent can only pass on the W allele.
3. Determine Offspring Genotypes:
- When W from Ww and W from WW combine, the offspring is WW.
- When w from Ww and W from WW combine, the offspring is Ww.
4. Calculate Probabilities:
- There's a 50% chance of having a WW offspring.
- There's a 50% chance of having a Ww offspring.
Given these results, the probability of having a homozygous recessive (ww) offspring is 0% since all offspring from this cross will have at least one dominant W allele (either WW or Ww).
In summary:
- For the first cross (Ww x ww), there's a 50% chance of Ww and 50% chance of ww offspring.
- For the second cross (Ww x WW), all offspring are guaranteed to have at least one dominant W allele, resulting in a 0% chance of homozygous recessive ww offspring.
### Part 1: Crossing a Heterozygous Male (Ww) with a Homozygous Recessive Female (ww)
1. Identify Parent Genotypes:
- Male: Ww (heterozygous)
- Female: ww (homozygous recessive)
2. Create Possible Offspring Genotypes:
- The male can pass on either the W or w allele.
- The female can only pass on the w allele.
3. Determine Offspring Genotypes:
- When the male gives the W allele and the female gives the w allele, the offspring is Ww.
- When both give the w allele, the offspring is ww.
4. Calculate Probabilities:
- There's a 50% chance of having a Ww offspring.
- There's a 50% chance of having a ww offspring.
This results in:
- 50% probability for Ww offspring
- 50% probability for ww offspring
### Part 2: Crossing a Heterozygous Individual (Ww) with a Homozygous Dominant Individual (WW)
1. Identify Parent Genotypes:
- One parent: Ww (heterozygous)
- Other parent: WW (homozygous dominant)
2. Create Possible Offspring Genotypes:
- The Ww parent can pass on either the W or w allele.
- The WW parent can only pass on the W allele.
3. Determine Offspring Genotypes:
- When W from Ww and W from WW combine, the offspring is WW.
- When w from Ww and W from WW combine, the offspring is Ww.
4. Calculate Probabilities:
- There's a 50% chance of having a WW offspring.
- There's a 50% chance of having a Ww offspring.
Given these results, the probability of having a homozygous recessive (ww) offspring is 0% since all offspring from this cross will have at least one dominant W allele (either WW or Ww).
In summary:
- For the first cross (Ww x ww), there's a 50% chance of Ww and 50% chance of ww offspring.
- For the second cross (Ww x WW), all offspring are guaranteed to have at least one dominant W allele, resulting in a 0% chance of homozygous recessive ww offspring.
