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Malaria

Malaria

in humans, the set of diseases caused by infection by the protozoans plasmodium vivax causing the tertian type, P. Malariae the quartan type and P. Falciparum the quotidian or irregular type of disease, the names referring to the frequency of fevers. The fevers occur when the merozoites are released from the erythrocytes. The organisms are transmitted by the Anopheles mosquito.


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Beneficial mutations vs harmful

... Perhaps such mutations could be called "temporarily beneficial" . For example, maybe the sickle cell allele, which is more common where malaria is rampant, will be weeded out once malaria is no longer a threat to that population. i.e. it's "temporarily beneficial" . Of course, ...

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by wildfunguy
Wed Oct 09, 2013 3:30 pm
 
Forum: Evolution
Topic: Beneficial mutations vs harmful
Replies: 12
Views: 3813

Re: Natural selection ends in absurdity or nonsense

... that can cause it, one from the mother, one from the father. Each gene can be SC or non-SC. If you have two non-SC genes, you are susceptible to malaria (harmful). If you have one SC gene and one non-SC gene, you have protection against malaria (good). If you have two SC genes, you have SC anemia ...

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by Rap
Sun Jul 15, 2012 4:35 pm
 
Forum: Evolution
Topic: Natural selection ends in absurdity or nonsense
Replies: 26
Views: 17018

Re: Theories - Origin of Life

... genes. There's a good diagram of the gene clusters here . Your second point is also somewhat curious. Fetal hemoglobin actually protects against malaria, it is when that protection is removed as part of the development process, that children become exposed. So the mutation is initially deleterious ...

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by Luxorien
Fri Mar 23, 2012 7:22 am
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 559
Views: 755276

Re: Theories - Origin of Life

... second level at which this argument fails has to do with its relevance to the topic at hand. The fact that a single point mutation confers malaria resistance does not somehow go away because there is another mutation that can mitigate the effects of sickle cell anemia. Your first point ...

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by scottie
Tue Mar 20, 2012 2:22 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 559
Views: 755276

Theories - Origin of Life

... remind you that it was you who introduced the sickle cell as a beneficial mutation, that NS has (non randomly)selected to protect against against malaria. Actually, I mentioned HIV immunity and antibiotic resistance as examples of beneficial mutations. I brought up sickle cell anemia as an interesting ...

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by Luxorien
Sun Mar 11, 2012 6:13 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 559
Views: 755276
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