>what happens if i breed a pair of 100% hets? do i get the visual morph?

Hets have a gene pair in which the two genes are different. Generally these are a normal gene and a mutant gene. The mutant gene can be dominant, codominant, or recessive to the normal gene. When breeding two hets, each egg has a 25% chance of holding a baby with two normal genes in the gene pair, a 50% chance of holding a baby with a normal gene paired with a mutant gene (a het), and a 25% chance of holding a baby with two of the mutant genes in the gene pair.

Hets for a recessive mutant gene look normal. When breeding hets with a normal gene and a recessive mutant gene, the probabilities are as follows:
25% normal//normal (looks normal)
50% normal//mutant (looks normal)
25% mutant//mutant (shows the full mutant effect)

Hets for a dominant mutant gene look like animals with two copies of the mutant gene. When breeding hets with a normal gene and a dominant mutant gene, the probabilities are as follows:
25% normal//normal (looks and is normal)
50% normal//mutant (shows the full mutant effect)
25% mutant//mutant (shows the full mutant effect)

Hets for a codominant mutant gene do not look normal and do not look like animals with two copies of the mutant gene. (Pastel is a codominant mutant gene in ball pythons.) When breeding hets with a normal gene and a codominant mutant gene, the probabilities are as follows:
25% normal//normal (looks and is normal)
50% normal//mutant (looks like the het parents)
25% mutant//mutant (shows the full mutant effect)

The others have discussed breeding two hets for a recessive mutant gene. You should have the results when dominant and codominant mutants are in play, too.

Paul Hollander

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