Food & Drink2 mins ago
Blood types
What's the the difference between positive and negative blood types?
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For more on marking an answer as the "Best Answer", please visit our FAQ.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?
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?