No, there is a 75% chance the gene will be passed on. in 3 of the 4 boxes a "b" is present... 3/4 = 75%.
B_ b_
B[BB Bb
B[BB Bb
I fail to see where this thrid "b" comes from in a BB and Bb pairing, Radagast even said as much earlier
"Parents BB Bb -> children 50% BB, 50% Bb
Parents Bb Bb -> children 25% BB, 50% Bb, 25% bb"
Therefore you are wrong in assuming that mixing the races will eliminate recessive genes.
Maybe, but those genes would never be expressed again outside of a few freaks.
And in the example in the Wikipedia article, they assume both parents carry one of each gene (Aa+Aa) I think that might indicate something, although I can't quite think what.
Weinberg principle) states that, under certain conditions, after one generation of random mating, the genotype frequencies at a single gene (or locus) will become fixed at a particular equilibrium value. It also specifies that those equilibrium frequencies can be represented as a simple function of the allele frequencies at that locus
Gene Migration
Many species are made up of local populations whose members tend to breed within the group. Each local population can develop a gene pool distinct from that of other local populations.
However, members of one population may breed with occasional immigrants from an adjacent population of the same species. This can introduce new genes or alter existing gene frequencies in the residents.
Here, this is from an article I found that used an example of a hamster population to conclude that once genetic equilibrium was established by mixing the population, the allele frequency was the same as before within that population. And indeed, such is shown in real life among white people's population as brown eyes never eradicated blue in that that races population.
But you seem to fail to apreciate that race mixing is mixing populations, and it would seem race/population mixing can alter the gene frequency.
So you you right about a population with no gene flow/migration such as within a race, a recessive gene could not be eradicated without genetic drift, as the Hardy-Weinberg Priciple states, but gene flow/migration is precisely what we are talking about when discussing the mixing of the races.
If you mean humanity as one giant "population" and the wrold wide freqency of b would stay consent at least in theory, I think genetic drift would have a real chance of wiping out b.
I'm not sure how a striaght theoreticl Harding Principle would look like though, or is it that there would be the same number of people carrying the b gene as toady if the races mixed and population numbers stayed the same? And so if there are 200 million blue eyed people today, in the mixed race there would be 200 million people with blue eyes?
I gather the Priciple applies once the population has reached "genetic equilibrium" (is completely mixed?) and I think that with the extreme numbers of BBs the frequency of b in a mixed race would be extremely small.
And while the b gene may arguably always exist, it is possible genetic drift will destroy it, especially if it's frequency is very low.
And furthermore, like I said, even if the b gene continues to exist, it will probably be very rarely expressed given that Bbs and bbs will be very rare and have poor chances of expression against a crush of BBs.
Yes, they are called Swedish. A good friend of mine gets that all the time, her reply is "No! I'm Swedish!"
Oh, ok.