Why there are 6 genotypes of the human blood types?

Does human blood have 6 genotypes?

Human blood type is determined by co-dominant alleles. … Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus. The different possible genotypes are AA, AO, BB, BO, AB, and OO.

What are the 6 blood types?

So, there are eight possible blood types:

  • O negative. This blood type doesn’t have A or B markers, and it doesn’t have Rh factor.
  • O positive. This blood type doesn’t have A or B markers, but it does have Rh factor. …
  • A negative. …
  • A positive. …
  • B negative. …
  • B positive. …
  • AB negative. …
  • AB positive.

What are the six possible genotypes of red blood cells?

A person’s specific blood type is due to the presence or absence of A and B sugar-protein complexes on the surface of red blood cells. There are three alleles involved, A, B, and O, and six possible genotypes: AA, BB, OO, AB, AO, and BO.

Can AA and SS marry?

AC is rare whereas AS and AC are abnormal. Compatible genotypes for marriage are: AA marries an AA. … And definitely, SS and SS must not marry since there’s absolutely no chance of escaping having a child with the sickle cell disease.

Can O and B have a baby?

An O and B crossing can not produce an A or AB child. An AB with an O can produce A children or B children but not O. In short the ABO system can prove you are not a parent but not that you are, as there are millions of other people with the same blood group.

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Is genotype different from blood group?

The difference between blood group and blood genotype

Within ABO blood group systems, there are four different blood groups; A, B, AB and O while for Rh D group system, there are two types – Rh D positive and Rh D negative. Blood genotype indicates of the type of protein (Haemoglobin) that is in the red blood cells.

Which blood group is best for marriage?

Based on these traits, the theory suggests these blood type matches are most likely to result in happy marriage:

  • O Male × A Female.
  • A Male × A Female.
  • O Male × B Female.
  • O Male × O Female.