why do only black people get sikle cell anemia?

Answer 1

The "sickle cell" gene (technically, allele) is a result of a mutation that modifies the shape of red blood cells. It's what is known as an incompletely recessive trait, meaning that a person with one copy of the sickle cell allele and one copy of the normal allele has mostly normal red blood cells with a few sickled ones. This state has been shown to give the person carrying it resistance to malaria, a common and often fatal disease in tropical regions, particularly Africa.
Thus in Africa, the sickle-cell allele would have been rendered more common by natural selection, since being resistant to malaria was a huge advantage. The children of two people carrying the sickle-cell trait have a 25% chance of receiving both sickle-cell genes from their parents, which is known as sickle-cell anemia.
It's not that only people of African descent can have sickle-cell anemia, but through selection the responsible gene was made more common because of malaria resistance. The same would not be the case in areas of the world where malaria was not common; which is why people whose ancestors came from other places are not as likely to have two parents carrying the sickle-cell trait.

Answer 2

Sickle cell anaemia is a genetic disorder. it is not caused by bacteria, viruses or any other external factor, but results from a particular instruction in the DNA. The disorder is therefore passed down to the offspring of the person with the original genetic mutation. In this case, the person happened to be black. Usually such genetic mutations do not carry on through generations, because the offspring will die before breeding. Sickle cell anaemia however renders the sufferer immune to the malaria virus. This means that in populations that are susceptible to be killed off by malaria, people with the sickle cell anaemia mutation are at an evolutionary advantage! This is a perfect case study of how Darwinian evolution takes place!

So to answer your question, the genetic mutation occurred and then survived in a region with malaria. In this case it happened to be Africa. When the gene is passed from parent to child, so too are the other genetic features of the African parent including dark skin and brown eyes.

Answer 3

human beings of ancestral African descent were statistically shown to be extra liable to sickle cellular anemia. it really is a genetic disease so sure, there's a gene that causes the gene-service to contract it. The trait for sickle cellular is surely a recessive one, so it take 2 sickle cellular gene vendors to reproduce someone with sickle cellular anemia... even then they purely have a 25% danger of doing so, because the toddler would might want to get both recessive genes from both father and mother. This genetic mutation developed to guard those with purely one sickle cellular gene from malaria, yet regrettably getting 2 genes is what makes some ill. Race truly is a social construct, it has no organic and organic foundation. the reason many sickle cellular victims take position to have darkish pores and skin tone is purely because it developed in an African climate a similar way human beings in Africa developed darker pores and skin for sunlight safe practices. some scientists and anthropologists pick to apply the racial words purely because it really is an basic thanks to provide someone a short obscure actual description. I wish there have been yet another be conscious for race yet then it would purely acquire a similar complications by turning right into a socially loaded be conscious besides.

Answer 4

. There are other population who also get sickle cell anemia. At least one of those populations evolved the disease separately from its evolution in Africa.
. All of the population which are prone to SCA are from regions where malaria is a problem. The disease is inherited in ones genes. If you get two copies of the sickle cell gene, you will have sickle cell anemia. If you get a single copy of the gene, you have much greater resistance to the microbe which causes malaria.

Answer 5

It is in their bloodlines. Since it is inherited recessively, BOTH parents must be at least carriers to have affected children, and logically, this would require several consecutive generations of mixed black and white children in order for the disease to be spread to white populations. Recessively inherited conditions tend to stay in blood lines (Tay-Sachs with Jews, alpha-thalassemia in asia populations, beta-thalassemia in meditteranean populations, cystic fibrosis in northern european populations, etc.)

Answer 6

IT'S A BONE DENSITY TRAIT IN BLACK PEOPLE WHICH CAUSES THE BODY AND BONE TO DETERIORATE.AND IT'S ALSO HEREDITARY. SOME CAUCASIANS WHO ARE MIXED WITH BLACK CAN ALSO GET THE TRAIT.

Answer 7

I've never heard of that, but ok.

Answer 8

it is in their genes ... inherirted one for the black race!