Explanation:
The inheritance of blood group B in women follows the principles of Mendelian genetics, where different alleles interact to determine the phenotype. Blood group inheritance is controlled by multiple alleles at the ABO gene locus, with the main alleles being A, B, and O.
In the case of blood group B in women, there are two scenarios:
1. **Homozygous Dominance (BB)**: If a woman inherits two B alleles (BB genotype), she will express blood group B. In this case, both alleles are dominant, and the phenotype is determined solely by the presence of the B allele.
2. **Heterozygous Dominance (BO)**: If a woman inherits one B allele and one O allele (BO genotype), she will also express blood group B. In this case, the B allele is dominant over the O allele, resulting in the expression of blood group B. This is known as co-dominance, where both alleles contribute to the phenotype.
Therefore, in women inheriting blood group B, dominance occurs either through homozygous dominance (BB genotype) or co-dominance (BO genotype), where the presence of the B allele determines the blood group phenotype.
