- 2,925
- United Kingdom
Huh? Back-pedal on what?I'm not mixing up anything, you were the one banging on about the starting grids for sprint events being majority black, you were the one linking it to being of African origin.
That you are now attempting to back-pedal on that fools utterly no-one.
They are majority/exclusive black and I still think genetics plays a factor in that.
ScaffI'm not mixing up anything, you were the one banging on about the starting grids for sprint events being majority black, you were the one linking it to being of Black African origin.
This all came from you saying:
Your own claim of the 'twitch xx gene' proves that, you attempted to claim it came from two population centres (those of African descent in the US and Caribbean). In doing so you ignored that those population centres are not a race and that the gene mutation isn't even close to being unique to those two populations
- I never talked about a "twitch xx gene"
- I never said any genes were unique
Again, I think you're getting confused with exclusivity and prevalence since you also said:
...if you're not saying its a black African gene then why are you so determined to state that it's only found in people of black African descent?"
when I clearly didn't say that.
I'll go a bit deeper with the cystic fibrosis example to try and clear this up....ScaffThat you are now attempting to back-pedal on that fools utterly no-one.
As said in my previous post, cystic fibrosis is more common in white populations compared to black ones.
If we look at a paper from when the genetics were first being understood you can see that they acknowledged a difference in the genetics between black and white sufferers of the disease:
The recent identification of the cystic fibrosis (CF) gene confirms that genetic heterogeneity occurs in CF. A three—basepair deletion in exon 10 resulting in a loss of the phenylalanine residue at amino acid position 508 of the gene product, termed the CF conductance regulator protein, accounts for 70% of cases of CF in white subjects. However, this gene defect occurs in only 37% of affected blacks. Analysis of CF genes from American blacks has revealed a number of mutations, most of which are unique to that population.
You can also see that there were mutations unique to American blacks, but that's beside the point.
Here is a more recent piece acknowledging the differences:
The researchers found that 90% of white patients and 83% of Native Americans with CF have a particular mutation (p.Phe508del), and about half of these individuals have two copies of these mutations. However, they found that 30% of Hispanics, 38% of blacks, and 41% of Asians did not even have one copy of the mutation. Patients of Hispanic, black, or Asian ancestry were also less likely to have two identified CFTR variants. “Our results confirm the widely held notion that the American College of Medical Genetics and Genomics list of 23 mutations that was specifically designed for carrier screening is inadequate for diagnostic testing, even though it is used widely,” commented Dr. Schrijver.
As you can see, this is just looking at genetic differences amongst those affected - you would expect therefore to see large heterogeneity between the general populations.
Wait what?ScaffThen why did you ignore it utterly when quoting (misleadingly) from your source?
You have repeatedly, over numerous threads, attempted to either remove or downplay environmental factors, instead focusing on the genetic link.
My own quote from the source shows environmental effects!
I included this:
Rather, my point is that an excessive emphasis on ACTN3 as a major explanation for Jamaican success does a grave disservice to the complex interplay of genetic and environmental factors required for top-level athletic performance.
and:
The ACTN3-centred argument also dismisses the importance of Jamaica's impressive investment in the infrastructure and training system required to identify and nurture elite track athletes, the effects of a culture that idolises local
track heroes, and the powerful desire of young Jamaicans to use athletic success to lift themselves and their families out of poverty.
So let's turn the tables and ask you, do you believe genetics play a part in sprinting success and do you believe these genes are unevenly spread throughout the world's populations?
I was literally explaining the results of the actual study(ies)ScaffThen you don't understand what quote mining is.