Genetika-guppy.my1.ru

Here is picture of my usual Lace Snakeskins

http://genetika-guppy.my1.ru/blog/2009-08-23-9

You should to analyse pair only - male + female for each breed.

Yes, smaller!!!

So these guppies are MMGG ??

Добавлено (10.05.2010, 02:17)
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MGex Right?

Vladimir said that you can make crossing between Moscow Green and Full Platinum (Pearl). After that F1xF1 and you get part of these guppy

Does Full Platinum carry Snakeskin? Or, is Snakeskin=Full Platinum?

Snakeskin and Lace are heterozygous genotype of Full Platinum.

For example - crossing between Full platinum and Wild guppy - in F1 all males have snakeskin!!!

So, if I take my Lace Snakeskin males to Green Moscow females, then cross the F1, I should see some of these Blue Lace Snakeskins that Vladimir has created?

I am surprised he did not use Blue Moscow females.

P S P= Platinum S=Snakeskin or other
P PP PS
S PS SS

We should get 25% pure homozygous Platinum; 25% homozygous Snakeskin or other. No?

Platinum (Pearl) is Above Secondary sex Color gene.

I mean it is strong linked genes.

When we will have interaction both genes we get phenotype.

Platinum or Pearl is seperate. I can understand.

Heterozygous Platinum = Snakeskin. No?
Homozygous Platinum = ? Here, I am lost. It seems to me that a heterozygous situation with
Platinum would be impossible to maintain unless Platinum, too, were
sex-linked. So, are we saying both snakeskin and Platinum are
carried on Y chromosome, and X does not carry Platinum? Then we
would have steady heterozygous situation. Or, Y carries Snakeskin
and X carries Platinum-- still a maintainable heterozygous situation.

The tail has fine rosette, chainlink pattern like body. This trait is X-linked always so far as we know.

Snakeskin (Zebrinus, Lace) is genes which determining the position of the pattern on body and fins (Secondary Sex color gene)

Base body colors are genes which determining pigments sintesis.

Now this I understand and agree 100% yes, yes. : D

Pearl is Independed gene. It is gene of Pearl quantity.

This I understand 100%

What I do NOT understand is how Snakeskin / Cobra can be HETEROZYGOUS for Pearl always.

Here is why I do not understand: A gene in a heterozygous situation will sooner or later find itself with a mate (Homozygous), or none at all (NO Pearl). But in my snakeskin families, I never see the Homozygous situation or NONE AT ALL situation appear. In other words, how will I know if Heterozygous Pearl gene gets doubled and becomes Homozygous? Or, how can I tell if there is no Pearl at all?

See, in six years of having these snakeskins, I have seen no variety - no change.

So, is Pearl carried 100% on Y chromosome? And so always there like this: Y (snakeskin + Pearl) X (Lace + NO Pearl).

Добавлено (14.05.2010, 00:44)
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Blue Glass Guppy is actually a red guppy that has 1 Asian Blau gene (r2), so is heterozygous for Asian Blau.

But if you purchase a trio of Beautiful Blue Glass guppies and allow to mate the genes will segregate.

r2= Asian Blau (Is Co-dominant)
G= Grey Body (wild type)

So in F2 and F3 you will have: Gr2=Blue Glass r2r2= Homozygous Asian Blau (weak, small, blue fish with no pattern/no glass pattern) and finally you will have GG= Red Glass.

The heterozygous Blue Glass population will not stand forever on its own; breeder must select wisely.

If snakeskin = heterozygous Pearl; then what are the alternate phenotypes, and why do I never see?

Make sense?

Pearl is additional pigment sintesys.

Snakeskin - it is pattern of pigment cells.

Like

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