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#96832 - 04/22/06 11:53 PM Breeding for Leuc

I am very interested in breeding for leuc and would like to know where the best place to find info on what percentages and definitions of terms and such could be found? I appreciate any help that anyone can give me.

#96833 - 04/23/06 12:18 AM Re: Breeding for Leuc [Re: ]

lol wow this should be fun lol

Well for 100%s One parent must be a leucistic..

66% parents both are 100% leu hets

50%s one parent 100% other 66% or lower or normal in color

If a 66% or 50% has a white baby then it is a 100% then because it is proven.

leu het to leu het breeding 1 in every four babies should be leu and 2 in every 4 babies should be hets and 1 of every four babies should be a normal.

And a leu to het breeding 1/2 hets 1/2 leus

and a leu to normal breeding all hets

this wasnt really detailed but lol it pretty much sums it up gets to the point and just hits the nail on the head about breeding for leus or any simple ressive gene.

#96834 - 04/23/06 12:53 AM Re: Breeding for Leuc [Re: ]
Judie Offline
Serious Glideritis

Registered: 10/25/01
Posts: 9173
Loc: Edwardsville, Kansas 66113
Leucistic to 100% Leu Het.... 1 out of 2 of the offspring will be Leucistic (Black Eyed White). All normal colored babies will be 100% Leucistic Hets as they will be given a Leu gene from each parent.

Leu x to Standard Variation.... none of the babies will exhibit the white coloration as they will only be given one white gene which will be passed from the one Leu parent. Thus... since all of the offspring have One white gene all offspring will be carriers for the Leucistic variation. Thus... they are called 100% Leu Hets.

100% Leu Het x 100% Leu Het: 2/3 of the offspring should carry the Leucistic gene. One out of three of the babies will not and will only carry the Standard Color variation. Thus... offspring of two 100% Leu Hets are called 66% Possible Leu Hets.

100% Leu Het x Standard.... offspring produced are 50% Possible Leu Hets. Thus.... for every two babies produced from this pairing... 1 will carry the Leu gene.

50% Leu Het x to Standard.... offspring produced are 25% Possible Leu Het. Thus.... for every four offspring produced from this pairing... 1 will carry the Leu gene.

When a Possible Leu Het produces White... then He/She is Proven Leu Het and then called a 100% Leu Het.

My first White babies were produced from a Leu Female whose name is Sesamie and a 66% Possible Leu Het male named Shy Baby. <img src="/ubbthreads/images/graemlins/heartpump.gif" alt="" />
Web site:

#96835 - 04/23/06 10:22 AM Re: Breeding for Leuc [Re: ]

so if a 66% and a standard, breed, is there a chance of having white babys? or do they just give normal garys, that have a chance of the the gene, like 33% hets?

#96836 - 04/23/06 10:52 AM Re: Breeding for Leuc [Re: ]

they will just give you possible hets... no idea what the percent will be...

however - Judie I think you made a small mistake, a standard colored baby out of a leu and a 100% leu het will be a 100% leu het because it got the leu gene from ONE parent (if it had leu genes from both parents it would be a leu, or atleast that's my understanding of how the leu gene works)

#96837 - 04/23/06 11:12 AM Re: Breeding for Leuc [Re: ]
Judie Offline
Serious Glideritis

Registered: 10/25/01
Posts: 9173
Loc: Edwardsville, Kansas 66113
It takes one gene copy of the BEW Variation from each parent in order to produce White.

Leucistic (BEW) x 100% Leu HEt.... for every two babies produced... 1 will be White and 1 will be a Standard color. However, the Standard colored baby will be a gene carrier for the Leu Variation = 100% Leucistic Het.

66% Possible Het x Standard Variation will produce 33% Possible Hets. Which means... 1/3 of the babies have the probablity of being 100$ hets. 2/3 will not and will only be Standard Colored offspring.

These Percentages are on Average. However, they seem to be correct. I have three BEW's that are paired to 100% Leucistic Hets and the ratios above seem to produce white as written above.

Edited by Judie (04/23/06 11:21 AM)

#96838 - 04/25/06 08:28 PM Re: Breeding for Leuc [Re: ]

When a Possible Leu Het produces White... then He/She is Proven Leu Het and then called a 100% Leu Het.
Does this mean that the parents % are changed or the offspring are considered 100% leu het?

#96839 - 04/25/06 09:37 PM Re: Breeding for Leuc [Re: ]

The Parent is then considered a 100% het. The white baby would simply be a Leucistic. Any normal colored siblings of the Leucistic would then be 66% het for Leu if I understand it right <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

#96840 - 04/25/06 09:41 PM Re: Breeding for Leuc [Re: ]

If a possible leu het becomes proven, it could mean that the parents percentage changes, but you don't always know. If two 50% hets produce a joey that eventually proves, it means that at least one parent is a 100% het, but you wouldn't know which one.

If you have a 100% het with a 50% het, their babies are guaranteed 50%/possible 66& chance to be a het. If the same parents produce a leucistic baby, that proves that they are both 100% hets, so future joeys would be guaranteed a 66% chance of being a het. So once the parents percentage changes, so will their joeys.

#96841 - 04/26/06 05:06 PM Re: Breeding for Leuc [Re: ]
itsasugarglider Offline
Glider Slave

Registered: 09/30/05
Posts: 1603
Loc: Nevada
...I'd love to help...
But everything that was just said flew right over my head -_-;
It is the mark of an educated mind to be able to entertain a thought without accepting it.

The aim of education should be to teach us how to think rather than what to think.

The difference in involvement and commitment is like a ham omelet. The chicken was involved. The pig was committed.

#96842 - 04/26/06 07:14 PM Re: Breeding for Leuc [Re: ]

Quick question! So if you have a leu mom and a leu dad you will have leu babys?

#96843 - 04/26/06 07:58 PM Re: Breeding for Leuc [Re: ]

The nature of DNA is a double helix. Each gene contains two alleles. One allele from the mother the other allele from the father. So over all 1/2 of genome (the complete DNA make up) comes from each parent.

A phenotype is an expression of one or many gene(s) that can be seen. A genotype is the genetic sequence for a given phenotype.

A gene can have different modes of expression for various phenotypes which are: recessive, dominate, co-dominant, Incomplete Dominance, and penetrant.

Recessive: a gene that is recessive requires both alleles of the genotype for the phenotype to be expressed. This is the case for leucistic. So A+A= Wild Type, A+a= Wild Type, a+a= Recessive Phenotype.

Dominant: a gene that is dominant requires only one allele of the genotype for the phenotype to be expressed. This is thought to be the case for White Faced Gliders. So A+A= Wild Type, A+a= Dominant Phenotype, a+a= Dominant Phenotype.

Co-Dominance: two different alleles both having their own unique homozygous forms, act to affect the phenotype and both are fully expressed. This is the case for White Faced Blonde Gliders. Both white face and blonde are expressed. So A+A= Phenotype A, B+B= Phenotype B, A+B= Phenotype A and Phenotype B.

Incomplete Dominance: This is where the phenotype of the heterozygote is intermediate between the phenotype of the recessive and dominant phenotype. The most frequently used example of this is the flowers of the snapdragon plant. The recessive genotype rr produces a white flower while the dominant genotype RR produces a red flower; however, the heterozygous genotype Rr produces a pink flower. So A+A= Phenotype A, a+a= Phenotype B, A+a= Phenotype AB which is a blending of A or B but similar to both. I do not know of any sugar glider coat color variations that would fit this mode.

Penetrance is the measure of the expression of a phenotype. Most genes in the body act only as a small contributing factor to some greater effect. That is to say that there can be many genes involved in the expression of a phenotype. Lets say that a Phenotype can be expressed by a combination of genes A-E.

The phenotype can be expressed by the following combination: AabbCCdDee or aaBbccdDEE.

There can be several different allelic combinations that produce the same phenotype.

Penetrance is more of a sliding scale. A highly penetrant gene will show its phenotype regardless of any environmental influences, while a gene with low penetrance may or may not show its effects.

Penetrance has also been shown to be affected by age. A gene that has a penetrance of 10% as an adolescent might show a penetrance of 90% as a senior.

Determining the formula of how phenotypes of coat color in sugar gliders is more involved than just simple heredity. It is not all Punnet Squares and percentages. There is a lot more to it than that.

However, leucistic is just a simple one gene recessive that breeds true to the Punnet square and is highly penetrant. Just put two 100% hets together and you will probably get a white if they are allowed to breed long enough.

#96844 - 04/26/06 08:28 PM Re: Breeding for Leuc [Re: ]

To answer your question yes, every litter. This has already happened to.

Saleen (Leucistic) X Sammie (Leucistic) and had Horacio (Leucistic).


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