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you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)


if you consistently breed a carrier with a non carrier, you'll remove anemia from the gene pool in xx generations (based on the size of the population)

Rust wrote:

xaoshaen wrote:

Eziekial wrote:So if we didn't have mudfish, blacks would eventually subcomb to sickle cell enemia?

I'm not sure that succumb is the right word... sickle cell anemia isn't necessarily a bad thing.

Well it's homozygous lethal, isn't it? And heterozygous you still get sick. But you survive malaria better. So it's a survival trait in populations where malaria is endemic.

--R.

Exactly, in circumstances where malaria is a survival pressure, a certain frequency of the sickle cell gene becomes a benefit.

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)


if you consistently breed a carrier with a non carrier, you'll remove anemia from the gene pool in xx generations (based on the size of the population)

In practice this is nearly impossible to achieve within a significant population, provided the recessive trait is not survival selected against. You're also not guaranteed removal of the gene within any fixed number of generations, just a decreasing probability of it being passed on with each generation.

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)


if you consistently breed a carrier with a non carrier, you'll remove anemia from the gene pool in xx generations (based on the size of the population)

Sickle-cell anemia is a single amino acid change in a hemoglobin chain.

Inheriting two copies of the mutant gene is lethal. Getting one copy gives you the disease.

The problem is that if you live in an area with endemic malaria, having one copy of the gene lets you survive it better. And malaria's nasty.

--R.

DDT > Malaria, which goes to show that enviromentalists are nothing but a bunch of white racists! The banning of DDT was yet another plot to destroy the black man!

Umm what are you on Wrath Child. DDT will do nothing to the average human being unless you are constantly exposed to it for a period of time.

Malaria is a nasty virus that never leaves until you are dead.

I guess having a huge amount of DDT put on you might be worse than malaria, but that would likely kill you.

Ironfang wrote:Umm what are you on Wrath Child. DDT will do nothing to the average human being unless you are constantly exposed to it for a period of time.

Malaria is a nasty virus that never leaves until you are dead.

I guess having a huge amount of DDT put on you might be worse than malaria, but that would likely kill you.

Wrath was pointing out that DDT was an effective method of countering the spread of malaria. He then proceeded to surmise that "The Man" banned DDT in order to cause harm to Africans by removing a barrier to malaria epidemics. Yes, he was being sarcastic.

No, I think he was just being a raving idiot, like normal.

-Arlos

Arlos wrote:No, I think he was just being a raving idiot, like normal.

Wrath was pointing out that DDT was an effective method of countering the spread of malaria. He then proceeded to surmise that "The Man" banned DDT in order to cause harm to Africans by removing a barrier to malaria epidemics. Yes, he was being sarcastic.

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)


if you consistently breed a carrier with a non carrier, you'll remove anemia from the gene pool in xx generations (based on the size of the population)

That's not always 100% true, there are recessive genes.

Anemia isn't one of them

(not in the sense you are implying)

Both parents need to have one of the altered genes each. Two for each need to be altered to have the actual disease. (the child)

Harrison wrote:Anemia isn't one of them

(not in the sense you are implying)

Both parents need to have one of the altered genes each. Two for each need to be altered to have the actual disease. (the child)

This sounds like a description of a recessive trait to me.

Rust wrote:Sickle-cell anemia is a single amino acid change in a hemoglobin chain.

Inheriting two copies of the mutant gene is lethal. Getting one copy gives you the disease.

Sickle cell anemia is not a classic recessive trait.

xaoshaen wrote:

Harrison wrote:Anemia isn't one of them

(not in the sense you are implying)

Both parents need to have one of the altered genes each. Two for each need to be altered to have the actual disease. (the child)

This sounds like a description of a recessive trait to me.

Rust wrote:Sickle-cell anemia is a single amino acid change in a hemoglobin chain.

Inheriting two copies of the mutant gene is lethal. Getting one copy gives you the disease.

Sickle cell anemia is not a classic recessive trait.

It's not - a recessive trait is masked in heterozygotes.

--R.

Kizzy wrote:

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)


if you consistently breed a carrier with a non carrier, you'll remove anemia from the gene pool in xx generations (based on the size of the population)

That's not always 100% true, there are recessive genes.

blue eyes is a recessive trait

you could breed that out of a population if you tried

Sorry Tikker, guess I'm confused with what you are saying. Two parents with brown eyes CAN have a blue eyed baby.

But two homozygous brown-eyed parents could not have a blue eyed baby

Oh yeah, and blonde hair will be bred out in about 300 years or so I've heard.

Can we continue this discussion when I'm done with Biology?

Kizzy wrote:Sorry Tikker, guess I'm confused with what you are saying. Two parents with brown eyes CAN have a blue eyed baby.

you get 2 genes for eyes


1 from mom
1 from dad

if both are blue, baby has blue eyes
if 1 is blue, and one is brown, baby has brown eyes
if both are brown, baby has brown eyes

the blue eye gene is considered recessive because if brown is present, it will take priority

you pair enough blue eye'd people(or even better brown eye'd people with 1 blue gene) with people who have 2 brown genes, you can eliminate blue eyes from a population (over time)

forgot to add this


both parents could display brown eyes, but carry 1 brown, 1 blue

but if you continually breed those people, with just brown/brown, you'll wipe out the blue eye trait

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)

What? lol

My Dad has brown hair and brown eyes. My mom has blonde hair and blue eyes. I had blonde hair and blue eyes as a baby, and I still do, although my hair is "dark blonde" now. Am I not understanding what you said?

Mindia wrote:

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)

What? lol

My Dad has brown hair and brown eyes. My mom has blonde hair and blue eyes. I had blonde hair and blue eyes as a baby, and I still do, although my hair is "dark blonde" now. Am I not understanding what you said?

Your dad is not your biological father! O_o

Lueyen wrote:

Mindia wrote:

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)

What? lol

My Dad has brown hair and brown eyes. My mom has blonde hair and blue eyes. I had blonde hair and blue eyes as a baby, and I still do, although my hair is "dark blonde" now. Am I not understanding what you said?

Your dad is not your biological father! O_o

Yes he is. I look a lot like him. I think Tikker just got owned (again) unless he backpedals at this point, OR clarifies his position...

Mindia wrote:

Tikker wrote:you could breed it out of a "race" through selective breeding (culling)


anemia isn't a dominant trait, it's like blue eyes

ie, both parents need to have a blue eye gene to pass it on to their children. if one parent is brown/brown the baby will have brown eyes. both parents have to be blue/brown, or blue/blue (or any combination of the 2)

What? lol

My Dad has brown hair and brown eyes. My mom has blonde hair and blue eyes. I had blonde hair and blue eyes as a baby, and I still do, although my hair is "dark blonde" now. Am I not understanding what you said?

Then your father was heterozygous.

You get two copies of the gene for eye color. One from mom's egg, one from dad's sperm.

Blue eyes only show up if the child gets two copies of the gene for eye color being blue. So your mom has 2 copies of the blue eye gene ('blue/blue'), and she gave you one (she had to, after all).

Your dad could be either 'brown/brown' or 'brown/blue' -- but YOU'RE blue eyed, so we know he couldn't have given you a 'brown eye' gene, or you'd have brown eyes. So he had to give you a 'blue' gene. So he in turn has to have 'brown/blue' genes for eye color.

So if you marry a blue eyed woman, have kids, and they come out brown eyed, call your lawyer, 'daddy'.



--R.

heh