It's hard to explain how to do this bit exactly. Basically what I do is I pick one trait (in the example amel because I've listed it first) and keep it constant, varying all the other traits.

So first I picked "A", then I picked "B" and varied lavender giving:

ABL
ABl

then still keeping "A", I picked "b" and varied lavender giving:

AbL
Abl

then you move onto "a".


Does that help? I know I'm not very good at explaining things .

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1.0.0 Boa constrictor (Boa constrictor ...)

2.4.0 Corn snakes (Pantherophis guttatus)

I hate doing punnett squares for multiple traits - so I don't bother. There's easier ways.

IMO the easiest way to work it out is just breaking things down into the individual locuses, and then adding them back up.

The cross is: Normal het amel, anery, lavender x lavender. You then break this down into each individual locus.

1st: Het amel x not het amel: 50% het amel, 50% not het amel
2nd: Het anery x not het anery: 50% het anery, 50% not het anery
3rd: Het lavender x lavender: 50% lavender, 50% het lavender.

Now work out the offspring, using the percentages.
Normal het amel, Het anery, het lavender: 50% of 50% of 50%: 12.5%
Normal het anery, het lavender: 50% of 50% of 50%: 12.5%
Normal het amel, het lavender: 12.5%
Normal het lavender: 12.5%
Lavender het amel, het anery: 12.5%
Lavender het anery: 12.5%
Lavender het amel: 12.5%
Lavender: 12.5%

Add the percentages back up. ... if they don't hit 100%, you've missed one!

So I don't need to break it up with sperm cross with egg like a punnett? I can just list all the possibilities and then put them back together again. That's easier.

Sorry Toyah - working with percentages will just get me even more confused lol.

Well what I've done is sperm cross with egg...just in a different format . Say the normal het amel, her anery is the dad...then those 8 combinations I've put down are all the different sperm combinations. The single "ABl" would then be the egg combination.

Since the mother only has one possible combination she can offer her offspring then it can be done easily like this but if the mother had multiple hets then you would be better doing it in a punnet/table...thats not much harder though: you just list all the egg combinations down the way and all the sperm combinations along the way and cross them against each other. Its the same principle .

Toyah's method is probably the best for multiple hets (much less time consuming) but both will get there in the end.

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1.0.0 Boa constrictor (Boa constrictor ...)

2.4.0 Corn snakes (Pantherophis guttatus)

Hi guys,

Im currently doing my p.hd in genetics and have written an introduction to breeding genetics on my site.

Hope it can be useful.

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Something that I think should be made clearer to people new to genetics:

WHen people discuss percentages, they can be misleading. By using percentages near words like "clutch", it can seem that 50% albino means that half of your babies will be albino. This is not true (although could happen of course). The percentage actually applies to every individual baby critter. So being told there is a 25% chance of being BLAH doesn't mean that out of 4 hatchlings, one will be BLAH. This is likely to happen but not for sure... Strictly speaking, the 25% applies to a single individual meaning that there is a 25% chance that the child will be BLAH. Some newbies think that if this first baby actually turns out normal, it increases the chance of the next birth to be BLAH. (You've probably noticed by now that BLAH is a fictional genetic trait). This is not true, as the next baby will also have a 25% chance of being BLAH.

Some people don't figure this out it seems because they often do get the results in the way they expected, thinking the percentage applies to a clutch. Due to the statistics involved, you very often will get 3 normals and 1 BLAH if you are told you will get 25% blah. But this may happen sometimes and not other times. You may get all BLAH! Or all normal of course. This is because each individual baby goes through the process, not as a clutch.

Hope I explained that relatively well. Another way to look at it is this: A mother and father go to see a genetics counselor because they fear from their genetics that they will produce a child with a certain disease. They want to know what the chances are that the child will have the disease. The counselor may tell them that because of their genes, there is a 50% chance that the baby will have the disease. Now, many people go away from that, have a baby which unfortunately does have the disease and then they assume that this makes the next baby less likely to have it. Wrong. Assuming we are talking about the same mother and father, the process is starting all over. The next baby also has a 50% chance of having the disease. The parents could have 8 babies all with the the disease or 8 babies without the disease. Because of statistics, it will most likely be relatively even but the point it that each individual child has the percentage applied to them and this does not directly affect any future births.

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- Reptiles -1.1.0 Rhacodactlyus ciliatus1.0.1 Pogona vitticeps0.1.0 Elaphe guttata guttata- Mammals -0.2.0 Octodon degus1.0.0 Oryctolagus cuniculus2.0.0 Cavia porcellus1.0.0 Canis lupus familiaris- Wanted now! -0.1.0 Rhacodactlyus ciliatus- Wanted eventually -0.1.0 Chamaeleo calyptratus1.0.0 Elaphe guttata guttata0.0.1 Brachypelma smithi0.0.1 Chromatopelma cyaneopubescens

Whoever posted this.....thankyou!!! I really need to knuckle down on this subject (to learn ANYTHING I have to read, re- read, write, then draw the subject!) It's great having all the links on one page

I might ask a billion questions as I slowly go through it!

the thing with the squares i dont get is that none of them give all the letter genetics.
like for example a is for albino or aabb is for something else. i think it would be easier if someone puts up or knows the letter combos for colour and pattern morphs.

xsachax

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the letters can be anything you want them to be, and everyone seems to use different variations

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Generally, someone will explain at the start what "P" or "a" or "Jf" means before getting into it. If people just start showing you squares, they may be talking about bananas for all you know!

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- Reptiles -1.1.0 Rhacodactlyus ciliatus1.0.1 Pogona vitticeps0.1.0 Elaphe guttata guttata- Mammals -0.2.0 Octodon degus1.0.0 Oryctolagus cuniculus2.0.0 Cavia porcellus1.0.0 Canis lupus familiaris- Wanted now! -0.1.0 Rhacodactlyus ciliatus- Wanted eventually -0.1.0 Chamaeleo calyptratus1.0.0 Elaphe guttata guttata0.0.1 Brachypelma smithi0.0.1 Chromatopelma cyaneopubescens