Another Quick Question!!

[dsmalex97]

What happens when you take a homozygous and a heterozygous snake and breed them with each other? For instance a mojave with a blue eyed leucistic?

[Spaniard]

In your co-dom example you would get BELs and Mojaves with no normals possible out of that pairing.

[southb]

50 / 50 outcome

[Bluebead]

Mojave to BEL is misleading.
In a heterogenous to homozygenous breeding of different genes (ie mojave(het) & superpastel(homo))
you wll see 50% mojave x pastel and 50% pastel
Any Homozygenous animal will pass one gene to every offspring while a heterogenous animal will pass the gene to half of the offspring.
check out marks site
http://www.ballpython.ca/genetics.html
Hope this helps!!

[Bluebead]

I just wanted to clarify something I dont think I followed thru far enough with.
Since you can use a mojave to make a BEL, if you cross a mojave with a lesser BEL (super lesser) you will get
50%lessers
50% BELs (mojave xlesser)

Cheers
Abie

[dsmalex97]

Mojave to BEL is misleading.
In a heterogenous to homozygenous breeding of different genes (ie mojave(het) & superpastel(homo))
you wll see 50% mojave x pastel and 50% pastel
Any Homozygenous animal will pass one gene to every offspring while a heterogenous animal will pass the gene to half of the offspring.
check out marks site
http://www.ballpython.ca/genetics.html
Hope this helps!!

ahhhhhhh!! You answered my other question!! I just came on here to ask that, and it was already there lol.

So when you breed a homozygous and a heterozygous of different genes it makes a combination snake (being the pastel mojave), and the just heterozygouse versions of the homozygous that the original mojave was paired to(pastel)? Now no matter what snakes you use, as long as they are homo's and het's of different genes these odds will hit?

[dsmalex97]

ALSO!!

Just wanna clarify something else!

When 2 heterozygous of different genes(co-doms) are bred together say a pastel and a mojave, will that just produce pastel's and mojave's, and normals? Pretty much what I wanna know is in order to get that combination snake, you need to breed a homo with a het that are of different genes(super pastelXmojave)?

[nevohraalnavnoj]

ALSO!!

Just wanna clarify something else!

When 2 heterozygous of different genes(co-doms) are bred together say a pastel and a mojave, will that just produce pastel's and mojave's, and normals? Pretty much what I wanna know is in order to get that combination snake, you need to breed a homo with a het that are of different genes(super pastelXmojave)?

Each parent has a 1/2 chance of throwing their co-dom gene. So half the babies will get the mojave gene, half the pastel. Because these events are independent, it works out that

25% will be normal
25% pastel
25% mojo
25% mojo-pastel


JonV

[anatess]

Each parent has a 1/2 chance of throwing their co-dom gene. So half the babies will get the mojave gene, half the pastel. Because these events are independent, it works out that

25% will be normal
25% pastel
25% mojo
25% mojo-pastel


JonV

Okay guys, these percentages are killing me. I just can't seem to get my head around this genetics thing. I'll go to super simple. PASTEL X PASTEL. Both snakes have a pastel and a normal gene. When you say 1/2 chance of throwing a co-dom gene... you really didn't mean that you will ALWAYS have HALF the babies getting the pastel gene right? You really meant to say EACH EGG has a 50% chance of becoming a pastel? So, if you are completely an unlucky sort of chap, you could POSSIBLY get an entire clutch of ALL normals. Right??? Or, on the flip-side, if you are the luckiest guy in the world you can have an ENTIRE clutch of super-pastels???

If that's the case, then it really is not a good thing to say 25% WILL BE normal because it is misleading, but more like each egg has a 25% CHANCE of being normal, right?

Or am I really completely wrong on this matter?

[kc261]

Anatess, you are completely right. When talking about odds or percentages in the outcomes of genetic problems, it is always the chance that each egg has of carrying those genes. So in the example you quoted, it would be much more accurate to say "expect that about 25% will be normals" rather than declaring "25% will be normals".

However, since most people are lazy, it often gets abbreviated to something like "25% normals". Also, I think people assume that everyone understands that we are only talking about the odds, not guaranteed outcomes, but it is an issue that confuses a lot of people.