Answer :
Certainly! Let's go through this problem step by step:
Part 1: Crossing a Heterozygous Male (Ww) with a Homozygous Recessive Female (ww)
1. Genotypes of Parents:
- The male has the genotype Ww (one dominant allele W, one recessive allele w).
- The female is homozygous recessive with the genotype ww (two recessive alleles).
2. Possible Offspring Genotypes:
- The male can contribute either a W or a w allele to the offspring.
- The female can only contribute a w allele.
3. Offspring Combinations:
- If the male contributes W and the female contributes w: The offspring has genotype Ww.
- If the male contributes w and the female contributes w: The offspring has genotype ww.
So, the possible genotype outcomes for offspring are Ww (heterozygous) and ww (homozygous recessive).
4. Probability of Heterozygous Offspring (Ww):
- There are four possible offspring outcomes in this cross: Ww, Ww, ww, ww.
- Two out of these four outcomes are heterozygous (Ww).
Therefore, the probability that an offspring will be heterozygous is [tex]\( \frac{2}{4} = 0.5 \)[/tex] or 50%.
Part 2: Crossing a Heterozygous (Ww) with a Homozygous Dominant (WW)
1. Genotypes of Parents:
- One parent is heterozygous with genotype Ww.
- The other parent is homozygous dominant with genotype WW.
2. Possible Offspring Genotypes:
- The heterozygous parent (Ww) can contribute either a W or a w allele.
- The homozygous dominant parent (WW) can only contribute a W allele.
3. Offspring Combinations:
- If both parents contribute a W: The offspring has genotype WW.
- If one parent contributes W and the other contributes w: The offspring has genotype Ww.
So, possible genotype outcomes for offspring are WW and Ww.
4. Probability of Homozygous Recessive Offspring (ww):
- None of the offspring combinations in this cross can result in the genotype ww.
Therefore, the probability that an offspring will be homozygous recessive is 0%.
So, to sum up:
- The chance that offspring from the first cross will be heterozygous is 50%.
- The probability of having a homozygous recessive offspring from the second cross is 0%.
Part 1: Crossing a Heterozygous Male (Ww) with a Homozygous Recessive Female (ww)
1. Genotypes of Parents:
- The male has the genotype Ww (one dominant allele W, one recessive allele w).
- The female is homozygous recessive with the genotype ww (two recessive alleles).
2. Possible Offspring Genotypes:
- The male can contribute either a W or a w allele to the offspring.
- The female can only contribute a w allele.
3. Offspring Combinations:
- If the male contributes W and the female contributes w: The offspring has genotype Ww.
- If the male contributes w and the female contributes w: The offspring has genotype ww.
So, the possible genotype outcomes for offspring are Ww (heterozygous) and ww (homozygous recessive).
4. Probability of Heterozygous Offspring (Ww):
- There are four possible offspring outcomes in this cross: Ww, Ww, ww, ww.
- Two out of these four outcomes are heterozygous (Ww).
Therefore, the probability that an offspring will be heterozygous is [tex]\( \frac{2}{4} = 0.5 \)[/tex] or 50%.
Part 2: Crossing a Heterozygous (Ww) with a Homozygous Dominant (WW)
1. Genotypes of Parents:
- One parent is heterozygous with genotype Ww.
- The other parent is homozygous dominant with genotype WW.
2. Possible Offspring Genotypes:
- The heterozygous parent (Ww) can contribute either a W or a w allele.
- The homozygous dominant parent (WW) can only contribute a W allele.
3. Offspring Combinations:
- If both parents contribute a W: The offspring has genotype WW.
- If one parent contributes W and the other contributes w: The offspring has genotype Ww.
So, possible genotype outcomes for offspring are WW and Ww.
4. Probability of Homozygous Recessive Offspring (ww):
- None of the offspring combinations in this cross can result in the genotype ww.
Therefore, the probability that an offspring will be homozygous recessive is 0%.
So, to sum up:
- The chance that offspring from the first cross will be heterozygous is 50%.
- The probability of having a homozygous recessive offspring from the second cross is 0%.
