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The cross IAIB × IAIB results in the genotypes IAIA, IAIB, IBIB, and IAIO.

1. Gregor Mendel is known as the father of genetics for his discovery of hereditary laws.
2. Different expressions of the same trait are determined by allelomorphs.
3. The cross IAIB × IAIB results in the genotypes IAIA, IAIB, IBIB, and IAIO.
4. Crossing with Tt produces 50% recessive and 50% heterozygous dominant offspring.

Correct answer: The cross IAIB × IAIB results in the genotypes IAIA, IAIB, IBIB, and IAIO.

Solution

The cross IAIB × IAIB cannot produce the genotype IAIO because the O allele is not present in the parental genotypes. The correct genotypes are IAIA, IAIB, and IBIB.

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