Explain the two inheritance patterns of blood type

The ABO blood type is inherited in an autosomal codominant fashion.

The Rh system of blood groups determines the gene that forms two alleles: dominant (D) and recessive (d).

Explanation:

The dominant allele determines the synthesis of antigen D, so people with this antigen are referred to as Rh +. The recessive allele is dysfunctional so no D antigen is produced and individuals are Rh-

The ABO blood group system determines a gene that has three alleles:

A,  B, and O allele.

Alleles A and B are functional and determine the synthesis of certain antigens (agglutinogens A B) that are found on erythrocytes.

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explanation:

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse