The argument regarding Haldane’s rule is also meaningless because different species in the animal kingdom can breed and still produce fertile offspring. The wolf (Canis lupus) and the dog (Canis lupus familiaris), the coyote (Canis latrans), and the common jackal (Canis aureus) are separate species yet can all interbreed and produce fertile offspring.
This person never went to university. I know species can mix and make fertile species. It is why there is many species theories. It has been shown these theories all have flaws just help classification. It did fail to mention anything specific or health problems. In university my teacher argues it might provide an advantage because the offspring will be better adapted to be in different environment.
1. Biological species concept (The one learned in high school)
The members of the same species may reproduce and form fertile offspring.
Problem: Some non species make fertile offspring.
2. Ecological species concept
The members of the same species exploit niches in the same manner.
Problem: It’s obvious why…
3. Phylogenetic species concept
The members of the same species concept is of the same ancestry.
Problem: A lot of animals have similar ancestry and change a lot.
4. Morphological species concept.
The species are anatomically distinguished as different species.
Problem: There is a butterfly that copies the monarch though it is not poisonous.
The reason that mixed-heritage patients are so hard to match can be found in the immune system. Different races have developed certain proteins, or markers, that are part of the body's natural defenses. These markers help the immune system determine which cells are foreign and should be rejected.
The reason that mixed-heritage patients are so hard to match can be found in the immune system. Different races have developed certain proteins, or markers, that are part of the body's natural defenses. These markers help the immune system determine which cells are foreign and should be rejected.
1. Anyone with certain blood types risks rejecting their child. In pharmacies there are drugs to stop the body from rejecting the baby. “ABO incompatibility occur mostly with babies whose mothers have O blood type and where the baby is either A or B blood type. If different blood types mix, an immune response occurs and the person will produce antibodies to attack the foreign blood antigen. During pregnancy the mother’s and baby’s blood generally do not mix.â€.
2. If you don’t want to watch all then skip to 2:20. Individuals prefer mates with different immune systems. It helps the baby fight off disease better when it has more variation.
https://www.youtube.com/watch?v=ZYUtVsA-wi4
Individuals with more diverse MHCs have an increased chance of survival under selection via infectious diseases. There is no guarantee two individuals from different ethnic backgrounds have completely different MHCs but it is much more likely than two parents of similar lineages.
A match between two people who share more genetically in common significantly reduces the risk of the donor and recipient cells attacking each other.
1. No shit cells from to different blood types will attack each other despite race. The body also decides to attack peanuts with allergies and overreacts.
Sickle-Cell Disease
Sickle cell anaemia is a condition found almost exclusively in blacks, about 1 in 4 west Africans carry the gene for it, almost no whites do. Any whites who carry the gene most likely have a black ancestor.
1. In Africa there is a lot of MALARIA. Natural selection has lead them to be heterozygous for sickle cell anemia because having it as a recessive inactive gene creates a better resistance. In first world countries with good pharmacy and less malaria it is not necessary. It then fades away…
End note…
It is biased and does not seem to argue any pros and even misrepresents context.
SIDE NOTE
I would mate with an alien if he was hot. I am in favor of acquiring genes that can help evolution and advances.