Biology, 23.12.2020 21:40 sierrawalk2283

There are three alleles for the ABO blood group in humans. Why are there only two alleles normally present in any individual? 1. The alleles for the ABO blood group always segregate independently during meiosis.
2. Each parent contributes only one allele for the ABO blood group to the offspring
3. Every gene for the ABO blood group must be recessive.
4. The alleles that determine the ABO blood group are on the X-chromosome.

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There are three alleles for the ABO blood group in humans. Why are there only two alleles normally p...