Which I why I said "
similar genus."
Yes, genus has something to do with it. You have to know the family and genus to see of they have a chance at being compatible. Comparing family classifications and genus is the first place to start.
You can not breed a Dispholidus typus (bloomslang) to a Pituophis catenifer (gopher snake) They are the same family, Colubrinae, but an incompatible genus.
However, you can breed a (Eastern ratsnake) Pantherophis alleghaniensis to (Common kingsnake) Lampropeltis getula. Why? Because they are a similar genus within the Lampropeltini Tribe.
It goes:
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Family: Colubridae
Subfamily: Colubrinae
Tribe: Lampropeltini
Genus: Pantherophis
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Subfamily: Colubrinae
Tribe: Lampropeltini
Genus: Lampropeltis
The breeding is compatible because the genus are similar from being in the same tribe. Knowing the genus helps you trace back to see if the snakes even stand a chance at being compatible. It's easier to start from the bottom up Genus, Tribe, Subfamily, Family, when comparing hybrid possibility.
Still, there are many things within a
family that can not produce offspring when crossed.
If you want to check to see if certain hybrids are possible, go here:
http://www.hybridhaven.net/index.php?sid=fca9a8da5127de0ffd9d0ad107b2f12b If it's possibly, that site will have info on it.