Quote Originally Posted by paulh View Post
Sperm from two donors do not combine. Under normal conditions, a fertilized egg results from either the pastel clown's sperm or the spider's sperm. NOT both males' sperm. If two fertilized eggs have different genes but are inside the same eggshell, you are likely to get a paradox snake.

One of the most common mistakes in beginning genetics is to assume that two gene pairs are only one gene pair. I see this pretty often in herper genetics forums.

In the following problems, pastel, clown, spider and pied are independent genes. The pastel gene and the corresponding normal gene are at the pastel locus. The clown gene and the corresponding normal gene are at the clown locus. And so on.
Gene pair 1 = pastel locus
Gene pair 2 = clown locus
Gene pair 3 = spider locus (sex-linked)
Gene pair 4 = pied locus

Pastel clown x het clown is a two gene pair problem.

pastel clown:
gene pair 1 = pastel mutant gene and normal gene
gene pair 2 = 2 clown mutant genes

het pastel:
gene pair 1 = 2 normal genes
gene pair 2 = 1 normal gene and 1 clown gene

pastel clown x het pastel produces
1/4 pastel clown
1/4 pastel (het clown)
1/4 clown
1/4 normal looking (het clown)

Spider x het clown is a two gene pair problem.

spider:
gene pair 1 = 2 normal genes
gene pair 2 = 2 normal genes
gene pair 3 = spider mutant gene and normal gene

het clown:
gene pair 1 = 2 normal genes
gene pair 2 = 1 normal gene and 1 clown gene
gene pair 3 = 2 normal genes

As gene pair 1 (the pastel locus) in both male and female have two normal genes, it can be ignored. Using only gene pairs 2 and 3 makes this a 2 gene pair problem.

spider x het clown produces
1/4 spider (mostly males)
1/4 spider (het clown) (mostly males)
1/4 normal (mostly females)
1/4 normal looking (het clown) (mostly females)


Pastel clown x pied is a three gene pair problem.

Pastel clown:
gene pair 1 = pastel mutant gene and normal gene
gene pair 2 = 2 clown mutant genes
gene pair 3 = 2 normal genes
gene pair 4 = 2 normal genes

pied:
gene pair 1 = 2 normal genes
gene pair 2 = 2 normal genes
gene pair 3 = 2 normal genes
gene pair 4 = 2 pied genes

As gene pair 3 (the spider locus) in both male and female have two normal genes, it can be ignored. Using only gene pairs 1, 2 and 3 makes this a 3 gene pair problem.

Pastel clown x pied produces
1/2 pastel (het clown and het pied)
1/2 normal looking (het clown and het pied)
(All babies will be 100 Het clown /100 Het pied.)

Clear as mud?
Truly appreciated


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