) In the example above, the Punnett Square represents a cross (mating) between a male (on the left side) with blood type AB, and a female, (top of square), with blood type A, genotype Ao.
Blood types, AA, AA, AB, Bo
assume that white color is dominant over yellow color squash. If pollen from the anthers of a heterozygous white-fruited plant is placed on the pistil of a yellow-fruited plant, show, using ratios, the genotypes and the phenotypes you would expect the seeds from this cross to produce.
To determine the possible blood types of the offspring from this cross, you can use a Punnett Square. Here's how to construct one and interpret the results:
1. Identify the alleles for each parent:
- Male (left side): AB (blood type AB)
- Female (top of square): Ao (blood type A)
2. Write down the alleles for each parent along the corresponding side of the Punnett Square:
- Male: AB (AB)
- Female: Ao (Ao)
3. Split the alleles from the male and female to fill in the squares:
- First, write the alleles from the male along the top row of the Punnett Square:
AB AB
- Then, write the alleles from the female along the left column of the square:
Ao
Ao
4. Combine the alleles to fill in the remaining squares of the Punnett Square:
- Combine the first allele from the male (AB) with the first allele from the female (Ao) to get ABAo, which represents blood type AB.
- Combine the second allele from the male (AB) with the first allele from the female (Ao) to get ABAo again.
- Combine the first allele from the male (AB) with the second allele from the female (Ao) to get ABAo once more.
- Combine the second allele from the male (AB) with the second allele from the female (Ao) to get ABAo for the final time.
5. Analyze the results:
- The Punnett Square shows that all possible offspring from this cross have blood type AB.
Remember, in a Punnett Square, the letters represent alleles, with dominant alleles written in uppercase (A) and recessive alleles in lowercase (a). By combining alleles from both parents, you can determine the possible genotypes and phenotypes of the offspring.