[MercedesK]

I assumed countryboy said that both parents were black hence the genetic makeup is supposed to be BBbb isnt it?

With that assumption the only explanation is either

1. The wife cheated
2. There was a mutation.
3. The kid is an albino.

[countryBoy]

well mercedes...i excluded the fact that the wife cheated...i said there was no away match involved.

Now can u be an albinoe and not look like one?
and yes the parents are BBbb like u said merc

i think stupak explained it but its still leaves somethin lingerin in my mind...what?...im not sure

[Mark Twist Thuo]

If the parents are BBbb there is no possibility, repeat, NO POSSIBILITY of them begetting a white kid.

Thats y after years and years of African descent you are still black and show no signs of turning white soon.

[MercedesK]

well countryboy if the genotype is BBbb then that means that there are no white genes anywhere so the question of recessive white genes does not factor. If you have two inferior genes bb and bb
when you combine them you get bbbb..that is still a black kid. Well unless of course there is a problem with gene expression.

The problem with gene expression arises when the individual has the genotype but does not express the phenotype due to a breakdown in the metabolic pathways. Either there is something lacking in the metabolic pathways that leads to the production of melanon secretins and enzymes..i vaguely remember something like that.

that could be an alternative but the mutation still stands

PS: If you think im bsing..eer...trust me my bio is not that shallow.

[Mark Twist Thuo]

>well countryboy if the genotype is BBbb
>then that means that there are no white
>genes anywhere so the question of
>recessive white genes does not factor.
>If you have two inferior genes bb and bb
>when you combine them you get bbbb..that
>is still a black kid. Well unless of
>course there is a problem with gene
>expression.

Merc

- You do not have inferior genes --> You call them recessive

- When you have a situation like bbbb- double recessive, you do not have a problem with gene expression. You just have a situation where the dominant traits are excluded and the recessive traits express themselves. e.g. blond hair and blue eyes are both recessive traits to the dominant black hair brown/black eyes.

[stupak]

This is much more complicated than it appears and is a combination of incomplete dominance where no allele is dominant over the other. The condition is recognized by the heterozygotes expressing an intermediate phenotype relative to the parental phenotypes ie a pointie but also gene linkage due to the presence of multiple alleles. This is where many genes have more than two alleles. This brings us to the discussion of interactions among genes and mainly epistasis which is when one gene interferes with the expression of another. Say a Black person has genotype BBbbXXxx ie black for BBbb and black eyes for XXxx. now say that XX is the most dominant gene. This means that any person with the XX gene will be black. So bbbbXXxx is black and so is any other combination with XX. Now say a white person is WWwwGGgg ie a white person with green eyes and say also that the GG is the most dominant gene, this means that any combination with GG will be white. Now cross BBbbXXxx and WWwwGGgg and you will get off spring of a certain ratio but note the kids that will be BBbbGGxx, BBbbGGgg, BBWWGGgg, bbbbGGxx, bbbbGGgg, BBWWGGgg, BBwwGGgg etc ie any combi that will have a GG will be white and those that will be WWwwXXxx, WWwwXXgg, BBWWXXgg will be black. It gets much more complicated when you try and determine the dominance over the GG and XX gene!

Well......do you gitch anything?

[countryBoy]

>
>Well......do you gitch anything?

ah ah not a thing ..lolol ... u know stupak i always wanted to be a biology major and thats the reason why i never did....i always got confused or lost somewhere along the way....

but i understood ur first reply it gave an answer but still left those tu swali's hanging if u know what i mean.... asanta

[Mark Twist Thuo]

Country/Stupak

I gave up those aspirations in college too after I took Cell Biology. This genetics crap is what did me in especially after you pass the basics of single and double inheritance and start dealing with transcriptions, translations sijui how mRNA and tRNA are made and how ......man... I survived bbut swore never ever bio again and to make matters worse you had to know the experiments that established e.g. gene mapping- rough ER, golgi whatever..then the next half of the class is memorising all these names of secretions, stages in the making of new DNA and you are competing with cut-throat pre-med students who take every test as a matter of life and death. When I saw the major had another Biology 305 simply titled" Genetics" on top of which you had to take the dreaded three- Organic Chem, Biochem and P-Chem that was it for me. Stupak many props if you went through with such a torturous course.

I generally hate cramming because it means studying more and spending too many sleepless nights trying to drill yourself.

[stupak]

Those are the tuquestions I was trying to answer in post 15. I don't know how to make it simpler, Merc, do you understand?

[slaggard]

there is no way that two parents both homozygous dominant would end up with a white kid. dwarfism is a disorder that results from autosomal dominant genes.
the only way the guy could turn out white is only
1) one of the parents is white(someone cheated)
2)some major mutation or disease(that could interest scientists--very very rare)
3) he is adopted
think about this....albinism that comes close to it, is a genetic disorder resulting from automal recessive genes. so, white and black has nothing to do with any disorder....its either someone contributes the gene or not.if the parents are black,its clear that its a recessive gene or its a matter of haplo insufficiency, because that kind of gene reflects in every generation(doesnt skip....someone will always have the phenotype)