Donate SIGN UP

Blood types

Avatar Image
Mark154 | 14:52 Thu 02nd Jun 2005 | Science
6 Answers
What's the the difference between positive and negative blood types?
Gravatar

Answers

1 to 6 of 6rss feed

Best Answer

No best answer has yet been selected by Mark154. Once a best answer has been selected, it will be shown here.

For more on marking an answer as the "Best Answer", please visit our FAQ.
Question Author

All is now clear.

Thanks fo3nix

We're all human. Why should different antigen systems develop?
Diversity provides advantages in the gene pool.

Thanks stevie, that makes it clearer. So the genes became more diverse in order to have advantages? Is that how we got different blood types?

Diversities in the gene pool susrvived because they provided advantages. They initially arose as random mutations but survived as they made the organism fit their environment somehow better : you make it sound like a conscious choice to change to *seek* an advantage. We get genetic mutations in every generation, it's normal. Natural selection and all that niceness.

The blood groups are A, B, AB and O.
Those with O are more susceptible to cholera, AB is the most resistant. As you inherit 2 chromosomes (one from each parent) blood type A means you have AA. B = BB. (remember AB is better in terms of cholera than either here).
If 2 AB parents have kids, only half their kids are likely to be AB, some will be AA, some BB, so we never get to the stage where only one blood type dominates (the other blood types all have their own advantages too : O is more resistant to malaria).

Make more sense?

1 to 6 of 6rss feed

Do you know the answer?

Blood types

Answer Question >>