7

Multiple Alleles and Blood Groups

CHAPTER OBJECTIVES
  • The ABO Blood Group
  • Function of IA, IB, and i Alleles of ABO the Gene

Mendelian genetics designates that genetic systems consist of two alleles. In Mendel’s experiment with peas, for instance, one allele coded for round seeds and another for wrinkled seeds; in cats, one allele produced a black coat and another produced a gray coat. For some loci, more than two alleles are present within a group of individuals—the locus has multiple alleles (multiple alleles may also be referred to as an allelic series). Although there may be more than two alleles present within a group, the genotype of each diploid individual still consists of only two alleles. The inheritance of characteristics encoded ...

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