Equal dominance?

[grantjames]

I've been reading up on genetics and I know how to draw the punnet squares to determine how the offspring will look.

However, what happens when 2 genes have equal dominance? So let's say I have 2 different recessive morphs, breed them together...what will the offspring look like?

The reason I ask is because I read a thing suggesting the "Spider" gene is dominant. So I was wondering what would happen if this was bred to a normal?

[Blackecho]

Different genes sit at different loci, so you can have more than one visible, you will effectively get a mix of them.

[alan1]

Originally Posted by grantjames

However, what happens when 2 genes have equal dominance? So let's say I have 2 different recessive morphs, breed them together...what will the offspring look like?

in this case, the "normal" gene is more dominant than the 2 recessive genes...
so, the offspring from an albino & pied pairing, would result in all of the clutch looking normal, but het for both albino & pied...

breed these offspring back to each other for a 1:16 chance (per egg) of the visual albinopied...

[bladeblaster]

Originally Posted by grantjames

I've been reading up on genetics and I know how to draw the punnet squares to determine how the offspring will look.

However, what happens when 2 genes have equal dominance? So let's say I have 2 different recessive morphs, breed them together...what will the offspring look like?

The reason I ask is because I read a thing suggesting the "Spider" gene is dominant. So I was wondering what would happen if this was bred to a normal?

when genes are quoted as being dominant, this is usually in relation to the 'normal' gene. Spider is dominant to the normal gene so a spider to a normal will produce spiders and normals.

In recessive genes say albino is recessive so the normal gene is the dominant gene in this case.

Originally Posted by Blackecho

Different genes sit at different loci, so you can have more than one visible, you will effectively get a mix of them.

[eeji]

a het spider would give spider and normal when bred to a normal, and a homo spider to a normal would give all spiders

[SNAKEWISPERA]

There is no het spider.

[Blackecho]

Originally Posted by SNAKEWISPERA

There is no het spider.

Yes there is, there is no known homozygous spider though as far as I'm aware.

However, genetically speaking, Ian is correct.

[SNAKEWISPERA]

Originally Posted by Blackecho

Yes there is, there is no known homozygous spider though as far as I'm aware.

However, genetically speaking, Ian is correct.

wait there.. so everything ive just been told has been thrown out the window... how is there a het spider?
spider is dominant?

[Blackecho]

Originally Posted by SNAKEWISPERA

wait there.. so everything ive just been told has been thrown out the window... how is there a het spider?
spider is dominant?

Heterozygous and Homozygous have nothing to do with Recessive, Co-Dominant and Dominant.

Genes come in pairs, is the pair are the same they are Homozygous, if they are different they are Heterozygous.

Recessive genes need to be homozygous to be visual as the 'normal' gene is more dominant.

Dominant genes such as Spider only need 1 gene to be visual as they are more dominant than 'normal'.

So basically every spider out there is Heterozygous as I don't think anyone has proven a Homozygous Spider.

[eeji]

there is indeed a het spider and a homo spider - they just happen to look the same.

a het spider x het spider breeding will produce 1:4 homo spiders, 1:4 het spiders and 1:2 normals (statistically)