Genetics

[MrSpike]

I've heard a fair few terms about genetics/gene's, and I was just wondering if anyone could clear them up. I've heard "Dominant", "Co-dominant" and "resesive". I'm guessing one of these would have to do with how a hypo trait is carried on and how the albino gene is carried on etc.

Thanks for any reply's.

Kane

[Chris89]

In genes:

Dominant: As in hair colour (parents and childs hair is always brown)
Co-Dominate: As in a parents hair colour is brown and blonde (But brown is the dominate colouring, but the Blonde comes through, making it co-dominant)
Recessive: Means a gene that is recessive (Meaning, it normally skips a generation, such as being left handed)

I think that's correct. Mind you I didn't pay that much attention in Biology

[grimbeny]

I thought handedness was genetic aswell but there were identical twins at my highschool one was left handed the other was right...

[MrBredli]

Check this site out Kane. It will answer all of your questions plus many more: http://www.supersnakes.com/gwiz.htm

[MrSpike]

Originally Posted by MrBredli

Check this site out Kane. It will answer all of your questions plus many more: http://www.supersnakes.com/gwiz.htm

Thanks MrB. Chris just confused me

Kane

[Chris89]

Originally Posted by MrSpike

Thanks MrB. Chris just confused me

Kane

Don't worry! I confuse myself

[junglepython2]

Things like handedness and hair colour are not as simple as dominant, recessive and co-dominant.

Each individual receives a set of genes from each parent. Called alleles, if one of those is dominant it will show through regardless of the other allele. So if an animal displays a dominant trait it either must have both dominant alleles or a dominant and a recessive as the dominant will mask the recessive. If this is the case it is called a Het for that trait.

If a trait is recessive such as albinism it must receive recessive alleles from both parents.

Co-dominant is when two different alleles are both displayed and neither is masked. An example is people with AB blood group. A and B are co-dominant while type O is recessive.

Despite this most traits are controlled by a combination of many different genes so it's not as simple as some people make out when predicting traits.

[DrNick]

To put it simply- Usually offspring will receive two alleles (or more) for specific traits from their parents (ie one set of genes from each), and yes it is much more complex than this..

If dominant then that gene will be expressed over the recessive gene from the other parent.

If co-dominant then both genes will be expressed (ie a mix of both)

If recessive then the trait will only be expressed if that recessive trait is recleived from both parents, that is why some people carry genes for diseases that they do not show signs/symptoms of BUT if they have offspring with people who also carry that recessive gene then their kids MAY have the signs/symptoms/display that disease/syndrome. I think albino's are like this.

I am slightly, well very to be truthful, drunk at this point so my facts may be slightly skewed... it has been ages since I studied genetics and it is MUCH more complex than my description..

[Mork]

http://anthro.palomar.edu/mendel/ A nice site with more than u need to know.

Every trait is coded for twice in the DNA of most animals. Using for instance a gene for albinism...this trait is recessive. That means that the animal must inherit the gene from both parents.
The normal colouring gene is dominant...this means that only one copy of the normal gene is needed for it to be expressed.
This is why a "het (heterogenous) for albino" looks normal but can produce albino offspring if matted with and albino or another het. Hets are carriers of the gene. They have one copy of the dominant normal gene and one copy of the recessive albino gene.
This is a very basic view of genetics.

Codominance is best seen in blood types where we hav the O, the A and the B genes (or alleles). O is the recessive allele while neither the A or B alleles is dominant over the other...so they are called co-dominant.
If a person has 2 A alleles or one A and one O allele they hav blood type A.
If they have 2 B alleles or one B and one O they are blood type B.
If they have 2 O alleles they are blood type O (the recessive allele is O).
But if they have 1 A and 1 B they are blood type AB.

Hopefully that clears things up a bit?

[DrNick]

ha ha ha, junglepython two was faster.. I keep hitting the wrang keys

[MrSpike]

Thanks for the comments guy's, helping me alot

With snakes what would the following be called?

Hypo
Patterning
Albanism

Sorry if that just confused you.

Kane

[junglepython2]

Albinism is recessive, patterning is controlled by many genes however some certain parts of it may be controlled by a single gene, not sure on hypo but I think it's also recessive

[Just_Joshin]

[Sdaji]

[Chrisreptile]

Originally Posted by womanator

wow, that cleared it up for me.