Punnett squares and breeding

[OTorresUSMC]

So while it is something im not likely to get into in the very near future i have been reading a lot about BP breeding and all the plethora of morphs. The one thing im a little confused on is the proper use of a punnett square in determining the possible resulting morphs. So to keep it simple lets say i want to take my Pastel, butter, ghost female and simply breed her to a normal wild type male. Could someone show me the breakdown and what that punnett square would look like? How many boxes how they'd be labled etc. Thank you in advance.

[piedlover79]

If you go to World of Ball Pythons they have a Genetic Wizard that will do the 'math' for you.

[OTorresUSMC]

If you go to World of Ball Pythons they have a Genetic Wizard that will do the 'math' for you.

Yea i have used that. I would like to just see the break down in an actual punnett square so im more familiar with their use. Particularly when youre getting into multiple genes and the number of squares needed

[piedlover79]

This website will help you set up a punnet square of more than one gene. http://scienceprimer.com/punnett-square-calculator

Science!

[Soord]

I worked yours out. The capital letters mean visual of the trait and lower case means normal.

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[Soord]

I worked yours out. The capital letters mean visual of the trait and lower case means normal.

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To get percentages count each square that are the same then divide by the total number of squares, so if you want to get percentages of het ghost normal you would count all the ppbbgg in the table and take the number of the square containing ppbbgg (16 in this case, 8 non visual columns from normal X 2 non visual columns from Pastel Butter Ghost combos) and divide by the total squares (64 in this case with an answer of .25 X 100 = 25%)

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[Soord]

I worked yours out. The capital letters mean visual of the trait and lower case means normal.

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Also I made a mistake because if it is dominant it still has a non-visual so dominant spider is still Ss because it can still make a normal. The difference is that a SS in the square won't make a super where as a BB (for butter) will make a BEL

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[JodanOrNoDan]

Also I made a mistake because if it is dominant it still has a non-visual so dominant spider is still Ss because it can still make a normal. The difference is that a SS in the square won't make a super where as a BB (for butter) will make a BEL

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SS will make a dead snake when S stands for spider.

[paulh]

Mating: Pastel, butter, ghost female x normal male. This is a three gene pair problem.

Female:
gene pair 1 = pastel gene and normal gene (the pastel gene is codominant to the normal gene)
gene pair 2 = butter gene and normal gene (the pastel gene is codominant to the normal gene)
gene pair 3 = two ghost genes (the ghost gene is recessive the to normal gene)


Male:
gene pair 1 = two normal genes
gene pair 2 = two normal genes
gene pair 3 = two normal genes

Determine number of types of gametes.

Female gene pair 1 produces two (2) types of gametes (pastel and normal).
Female gene pair 2 produces two (2) types of gametes (butter and normal).
Female gene pair 2 produces one (1) type of gamete (all are normal).
Total number of gamete types = number from gene pair 1 * number from gene pair 2 * number from gene pair 3 = 2 * 2 * 1 = 4

Total number of female gametes using checkerboard. Gamete types from gene pair 1 across the top, and gamete types from gene pair 2 down the left side.

.......| pastel .......| normal
--------------------------------------------------
butter | pastel-butter | normal-butter
--------------------------------------------------
normal | pastel-normal | normal-normal
--------------------------------------------------

Make a new checkerboard with gamete types for gene pair 3 at the top and the results of gene pairs 1 and 2 down the side. This produces four gamete types:
pastel-butter-ghost
pastel-normal-ghost
normal-butter-ghost
normal-normal-ghost

Male gene pair 1 produces one (1) type of gamete (normal).
Male gene pair 2 produces one (1) type of gamete (normal).
Male gene pair 3 produces one (1) type of gamete (normal).
Total number of gamete types = number from gene pair 1 * number from gene pair 2 * number from gene pair 3 = 1 * 1 * 1 = 1. The male produces only one type of gamete--normal-normal-normal

Number of boxes in Punnett square = number of female gamete types * number of male gamete types = 4 * 1 = 4.

Punnett square has male gametes at the top and female gametes down the side.

....................| normal-normal-normal
--------------------|------------------------------------------------------
pastel-butter-ghost | pastel/normal butter/normal normal/ghost
--------------------|------------------------------------------------------
pastel-normal-ghost | pastel/normal normal/normal normal/ghost
--------------------|------------------------------------------------------
normal-butter-ghost | normal/normal butter/normal normal/ghost
--------------------|------------------------------------------------------
normal-normal-ghost | normal/normal normal/normal normal/ghost
--------------------|------------------------------------------------------

Convert genotypes to phenotypes:
Genotype pastel/normal butter/normal normal/ghost produces phenotype pastel butter (het ghost).
Genotype pastel/normal normal/normal normal/ghost produces phenotype pastel (het ghost).
Genotype normal/normal butter/normal normal/ghost produces phenotype butter (het ghost).
Genotype normal/normal normal/normal normal/ghost produces phenotype normal (het ghost).

See https://en.wikipedia.org/wiki/Punnett_square for how to do a Punnett square with more complex genotypes in the parents and with the forkline method.

[Soord]

SS will make a dead snake when S stands for spider.

Yeah should have used pins but thought it would get confusing with the p

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