About het % question

[gothra]

What is the chances of an Enigma het Raptor x Mack Snow Tremper produce a Mack Snow Tremper Enigma het Raptor? Will that be 100% het Raptor? Or 50% het?

Please, I really don't understand this, how do you arrive at the percentages? :main_huh:

 

[kitty]

I originally started with cornsnakes because of the neat things you can do with their colors. My "crash-course" reintroduction to genetic inheritance started here: http://serpwidgets.com/Genetics/genetics.html

Chuck also has a self-published book on corn genetics, but I think last year he branched out into basic genetics for other reptile species, as well.

To break it down very simplistically, I'd start with a punnett square for each individual, single trait. Once you arrive at the percent chance for that single trait, you multiply the results for each trait you want to show up. Unfortunately, I'm not familiar enough yet with the leopard gecko genetics (vs. selectively bred "normal" traits) to calculate an example.

 

[gothra]

One more question, does "50% het xx" means there is 50% chance it is het for xx and 50% chance that it is not?

 

[Sandra]

For complex calculations you can use a genetic calculator such as Genetics Wizard, although genetic calculators are useless unless you have a decent knowledge of what you are working with.

You first have to break down what are your animals. So you have an Enigma het Raptor. That means that he/she is:

- Het enigma (because the het and homozygous form look the same and most if not all enigmas are hets.).

- Het Eclipse and het Tremper albino (because that's what being het Raptor means)

On the other hand you have a Mack Snow Tremper, which would be:

- Het Super Snow (it would be the same that just saying that it is a Mack snow, but when working with genetics calculators you need to state which are hets and which homozygous).

- Homozygous Tremper albino.

Enigma, eclipse, snow, and Tremper albino. That makes a total of 4 traits.

In your case, you would fill in the form as follows.

I usually leave the dominant/codominant checkbox blank. It doesn't help anyway. You just have to know that dominant hets look the same that the homozygous form, and that codominant hets look like a blend of the normal form and the mutant homozygous form.

The results would be:

Which in commercial speech would be:

6.25% normals, het Tremper
6.25% Mack snows, het Tremper
6.25% Tremper albinos
6.25% Tremper albino Mack snows
6.25% normals, het Raptor (or het Tremper & eclipse)
6.25% Mack snows, het Raptor (or het Tremper & eclipse)
6.25% Tremper albinos, het Raptor (or het eclipse)
6.25% Tremper albino Mack snows, het Raptor (or het eclipse)
6.25% enigmas, het Tremper
6.25% Mack snow enigmas, het Tremper
6.25% Tremper albino enigmas
6.25% Tremper albino Mack snow enigmas
6.25% Enigmas, het Raptor (or het Tremper & eclipse)
6.25% Mack snow enigmas, het Raptor (or het Tremper & eclipse)
6.25% Tremper albino Mack snow enigmas
6.25% Tremper albino Mack snow enigmas, het Raptor (or het eclipse)

As you can see, all the hatchlings would be het albino or albinos, so you can be sure that all those who aren't albinos will be hets.

Enigma and Mack snow hets are distinguisable from normals, so no problem on those either.

But the eclipse hets, you cannot distinguish them from non hets just by looking at them. All hatchlings would have a 50% chance to be hets, and 50% chance not to be.

So, until the offspring's genetics are proven by breeding, your 'results chart' would look like this:

12.50% normals, 100% het Tremper, 50% het Raptor (or eclipse)
12.50% Mack snows, 100% het Tremper, 50% het Raptor (or eclipse)
12.50% Tremper albinos, 50% het Raptor (or eclipse)
12.50% Tremper albino Mack snows, 50% het Raptor (or eclipse)
12.50% enigmas, 100% het Tremper, 50% het Raptor (or eclipse)
12.50% Mack snow enigmas, 100% het Tremper, 50% het Raptor (or eclipse)
12.50% Tremper albino enigmas, 50% het Raptor (or eclipse)
12.50% Tremper albino Mack snow enigmas, 50% het Raptor (or eclipse)

Hope that helped.

 

[gothra]

Thankyou Sandra, that's very informative!

I tried doing some reading on basic genetics today, it seems not compatible to my brain...you explained very well, I do understand what you're talking about! lol. Many thanks!

 

[paulh]

One more question, does "50% het xx" means there is 50% chance it is het for xx and 50% chance that it is not?

That is correct. Just like when a coin is flipped, there is a 50% chance that it will come up heads. There is also a 50% chance that the coin will come up tails instead.

If you take two coins, say a quarter and a penny, and flip them, there are 4 possible outcomes.

The 4 possible outcomes are
quarter - heads, penny - heads
quarter - heads, penny - tails
quarter - tails, penny - heads
quarter - tails, penny - tails

If you can understand why there are only four possible outcomes, then you can understand genetics.