blood problem?

Nov 16, 2015
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#2
Your mother would have to be genotype A/O +/-, phenotype A+

Your father would have to be at least heterozygous for O and Rh-, e.g. B/O +/- (phenotype B+) but capable of yielding offspring that are O- and O+.
 

sprotigal

New member
Nov 16, 2015
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#4
This is pretty much answered by the prior responses, but O is the most recessive blood type and RH- is recessive. Therefore, the blood types of parents can easily differ from O-.



The above presumes blood types are purely Mendelson traits, but the presence of a genetic trait does not indicate parentage; the absense does.



More directly answering your question, my understanding is that, for genetic analysis purposes, O type blood can be regarded as an absense of A an B traits, or a "null" trait. RH- is definitely the absense of the RH factor.



This sort of thing is part of the basis of the Neanderthal Hsn investigations. It is thought that O and RH- are characteristic of Neanderthal, but ethnic groups not associated with a high percentage of Neanderthal genetic heritage nevertheless have a high O rate. (I'm not sure about Rh, but this may be similar.)