Spider Albino Genetics Some Help please

[Brimstone111888]

I am trying to figure out the genetics of a spider albino, but I am not getting the results with a square. Could someone explain the normal gene to me? Is the normal gene dominant, co-dom, or recessive.

I was thinking it can't be dom or co dom because when it is breed to a dom or co dom the normal looking phenotype goes away, but when you breed recessives to a normal you still get hets and they still have the look of a normal. That has me a bit confused. Maybe someone can help and tell me where I am messing up.

S= Spider
N= Normal
a=Albino

Spider x Albino breeding

S N

a Sa Na

a Sa Na


So I get 50% spiders who are het for albino and normals who are het for albino. This is where I get lost.

Spider het albino x Albino

S a

a Sa aa

a Sa aa

So the result would be 50% Spiders het albino and 50% albinos. Still no Albino spider. I am sure my fault is in my punnet square, but I am not sure where. Thanks for the help!

[Moriar]

I am trying to figure out the genetics of a spider albino, but I am not getting the results with a square. Could someone explain the normal gene to me? Is the normal gene dominant, co-dom, or recessive.

I was thinking it can't be dom or co dom because when it is breed to a dom or co dom the normal looking phenotype goes away, but when you breed recessives to a normal you still get hets and they still have the look of a normal. That has me a bit confused. Maybe someone can help and tell me where I am messing up.

S= Spider
N= Normal
a=Albino

Spider x Albino breeding


S N

a Sa Na

a Sa Na


So I get 50% spiders who are het for albino and normals who are het for albino. This is where I get lost.

Spider het albino x Albino

S a

a Sa aa

a Sa aa

So the result would be 50% Spiders het albino and 50% albinos. Still no Albino spider. I am sure my fault is in my punnet square, but I am not sure where. Thanks for the help!

Normal is Dominate, if it was anything other im pretty sure it wouldnt be considered "Normal"

maybe Co dom morphs are stronger than the Normal gene so is expressed. or its on another loci and is not expressed when another allele is on the loci.

as for the punett i think you need to use a more advanced punett when you are dealing with something like this... like what each sperm/egg can hold in it etc... like the male spider can that is het for albino can produce a few different gametes... SNa is his genotype so he can produce Sa Sn Na sperm
the female can produce only albino eggs. since her genotype is aa

so the punett looks something like this i think

Sa SN Na

a Saa SNa Naa (albino)

a Saa SNa Naa (albino)

im not 100% on all of this since im still learning the more advanced punett squares but your Saa is your spider albino so its looking like 50% albino normal patterns and 50% spider albino

some big smart breeder correct me if i am wrong please

[bearhart]

Its pretty easy really. Each animal has a pair of each gene type. One of the pair it gets from its mother and the other one it gets from its father. However, which one its get from either parent's pair is random.

The other part is the dominance:

Recessive: The animal must have a full pair of the gene in order to display its effect.

Co-dominant: The gene shows some effect at half-pair and an enhanced effect when in a full pair.

Dominate: The gene shows the full effect whether or not its half or full.

[Brimstone111888]

I don't think you even read my post. I have a grasp on basic genetic terms.

[bearhart]

Sorry. I read it but perhaps I misunderstood you.

So, for a particular morph, if the gene is recessive then (I believe) that would basically mean the corresponding normal gene is dominant.

Now this part I'm a little more shaky on but this is how I understand it:
You don't have a single normal gene. So, for the spider gene "slot" you have either the morph or the normal. Likewise, for the albino "slot" you have a different normal.

So, if you crossed a spider het (SN) and an albino het (NA) you would get:

NN (25%)
SN (25%)
NA (25%)
SA (25%)

I do not know about the dominance of the genes so I don't know what they would look like.

[RandyRemington]

The thing to remember here is that spider and albino are mutations of different genes. Each gene also has a normal version. There isn't one normal gene but many normal genes.

Your square for spider het albino X albino might go something like this:

S - spider mutant version of the spider gene
s - normal version of the spider gene

A - normal version of the albino gene
a - albino mutant version of the albino gene


SsAa - Spider het albino
ssaa - Albino

.......SA......Sa......sA......sa
sa...SsAa...Ssaa...ssAa...ssaa

Where:

SsAa - Spider het albino
Ssaa - Spider albino
ssAa - Het albino
ssaa - albino

[bearhart]

So are all morphs based in different genes or are some combinations?

Do some genes have more than one different morph form?

[Purrrfect9]

So are all morphs based in different genes or are some combinations?

Do some genes have more than one different morph form?

For the most part, yes.

For your second question, the first thing that comes to mind is the lesser/mojave/butter mutations.They are differents morph forms of an allele because any combination of the three will produce a blue eyed lucy.