18. Cross a woman with heterozygous type A blood with a man with heterozygous type B blood. Show punnett square, give the phenotypic and genotypic ratios of their offspring. Genotypes Phenotypes

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**Crossing Heterozygous Blood Types: An Analysis**

**Question 18:** Cross a woman with heterozygous type A blood with a man with heterozygous type B blood. Show a Punnett square, and give the phenotypic and genotypic ratios of their offspring.

**Genotypes:**

A Punnett square is presented with four squares, used to predict the blood type traits of the offspring by crossing the parents' genotypes. In this case, the woman has heterozygous A blood type (AO), and the man has heterozygous B blood type (BO).

**Punnett Square Explanation:**

- Each parent contributes one allele for blood type.
- Possible alleles from the woman: A or O.
- Possible alleles from the man: B or O.

**Offspring Genotypes Derived from the Square:**

1. AB
2. AO
3. BO
4. OO

**Phenotypes:**

The possible blood types (phenotypes) of the offspring are:
- Type AB (from AB genotype)
- Type A (from AO genotype)
- Type B (from BO genotype)
- Type O (from OO genotype)

**Phenotypic Ratios:**
- 1 AB: 1 A: 1 B: 1 O

**Genotypic Ratios:**
- 1 AB: 1 AO: 1 BO: 1 OO

This exercise demonstrates the genetic variability possible with heterozygous blood type pairings, predicting an equal probability for each blood type.
Transcribed Image Text:**Crossing Heterozygous Blood Types: An Analysis** **Question 18:** Cross a woman with heterozygous type A blood with a man with heterozygous type B blood. Show a Punnett square, and give the phenotypic and genotypic ratios of their offspring. **Genotypes:** A Punnett square is presented with four squares, used to predict the blood type traits of the offspring by crossing the parents' genotypes. In this case, the woman has heterozygous A blood type (AO), and the man has heterozygous B blood type (BO). **Punnett Square Explanation:** - Each parent contributes one allele for blood type. - Possible alleles from the woman: A or O. - Possible alleles from the man: B or O. **Offspring Genotypes Derived from the Square:** 1. AB 2. AO 3. BO 4. OO **Phenotypes:** The possible blood types (phenotypes) of the offspring are: - Type AB (from AB genotype) - Type A (from AO genotype) - Type B (from BO genotype) - Type O (from OO genotype) **Phenotypic Ratios:** - 1 AB: 1 A: 1 B: 1 O **Genotypic Ratios:** - 1 AB: 1 AO: 1 BO: 1 OO This exercise demonstrates the genetic variability possible with heterozygous blood type pairings, predicting an equal probability for each blood type.
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