Please Explain Genotype AA

genotype is a broad topic to treat but i would say the much i know.
genotype Aa simply means homozygous dominant.non hereditary factors,variation and genotype generally determine/contribute to ones Phenotype.an individual genotype for a particular gene is the set of alleles it posseses.alleles are sequences that code the gene.

_{its quite broad,i just hope this would help.}

yes ,that would help too.
@ poster,goggle it for more info.

@mellow am still in school. 

I always thought the ABO system described blood groups and not genotypes.

ofcos the ABO system and antigens describe the blood groups .
traits,variations, are passed from parents to offsprings via genes hence genotype

SS is simply an adaptation to malaria which is why only blacks carry the gene.
It results from a single amino acid mutation in the heamoglobin gene such that red cells of SS patients are sickle shaped and have a lifespan half that of normal (AA) individuals.

Parents heterozygous for the S genotype (AS) are merely carriers and do not have the disease but will pass the gene to at least 25% of their offspring. It is a recessive gene as you need 2 defective alleles to get the disease (SS).
Two heterozygous parents (AS) will produce at least 1 in 4 chidren with the disease.

Since red cells are not concave like normal cells, they sometimes clog tiny capillaries giving rise to the severe pain and anemia that patients sometimes suffer (crises).

It has nothing to do with heart disease or diabetes.

As a public health service, I'll explain genotype AA for you. See the attached picture freely obtained from Wikip. To understand it in relation to your question, simply substitute R for A, r for S, so RR=AA, Rr=AS, rr=SS. If you understand it then you would appreciate what Davidlyn and Ifyalways were saying above, except that:

 
these highlighted projections are wrong. Using the image, can you work out the correct answers?

The protozoan, plasmodium, that causes malaria acts by destroying red cells in the body. That is why most malaria symptoms involve some anemia and general body weakness  . . .
SS genotype evolved as a way to beat malaria. Since red cells from SS patients are destroyed much more rapidly than in AA (normal) individuals, theoretically they stand a better chance of not developing malaria as the red cells carrying the vector are quickly destroyed.

typhoid is very different from malaria as it is a bacterial infection, it has nothing to do with genotype and can be effectively treated with a course of antibiotics.

Since you are white, it is 100% certain that you do not carry the S gene. None of your children will be turn out to be SS so you have nothing to worry about even if your husband is AS. However if he is SS . . . you have to keep in mind that they have a much shorter lifespan than normal individuals.

If you are AA, you are most susceptible to malaria . . . easiest way to combat this is to ensure you take a course of anti-malarial prophylaxis before coming to malaria endemic areas (aka subsaharan Africa which Nigeria happens to fall within). Ask your doctor, they should be able to get some for you.

well there, having a genotype AA only means that you have the A gene from both parents and doesnt particularly give you any health risks,  your kids have nothing to fear really as long as they observe basic rules of health. If you had the S gene, now there may be issues to talk about, when it comes to marriage, feel free and marry anyone, the worst that could happen is you kid(s) having another gene alongside the A gene. The A gene is the 'normal' adult hemoglobin type and the S,C E and other genes are abnormailties that arose due to envoronmental stresses on the hemoglobin chain, i hope i have spoken english so far, if you have any further questions feel free to post them , ill reply, and i wont charge you! afterall its nairaland.
talk to the deer.