homologous recomination

[delhanocs]

I'm studying "homologous recomination" but I cannot understand its mechanism clearly.Can you help me?Thank you for your reply

[sdekivit]

this is such a big concept. Tell where you're stuck.

[Bambi]

I know the definitions, which don't help me:
heterozygote=different alleles of one or more specific genes. It will produce UNLIKE gametes and thus will NOT breed true.

homozygote=true breeding oranizm because the alleles for a particular characteristic on each chromosome are identical, therefore produce the same phenotypical result.

I'm trying to figure out the geneology of my horses. I've gotten the color genes pretty much figured out.
In researching this info, I read that, I think it was pure white color?, can only be homozygote because if it was heterozygote it would be lethal to the embryo....or visaversa.
Can anyone explain that one to me
Thank you,
Bambi

[mith]

How would it be lethal?

[MrMistery]

There are certain genes(ban genes ) that in homozygous state are lethal, all of them are recessive, like the gene for hemophilia. these are a type of genetic deseases. but i doubt any of the alleles for the color of a hourse is lethal. And remember, all of these bad genes are lethal when in homozygous state, not heterozygous

[mith]

To me, bambi seems to be saying the white color is linked to lethality...

[MrMistery]

Maybe, but as i said, it is highly improbable. Since you gotta think that the color only codes for an enzyme that encreases or decreases the secretion of MSH, resulting in more or less melanine...