While anything is possible in SciFi, interspecies breeding can lead to sterile offspring (e.g. mules). However, I don't think they ever implied Spock was sterile it might not be an issue.
Conversely, I'd assume the cross breed would probably exclude females.
no subject
Date: 2009-05-12 09:08 pm (UTC)Conversely, I'd assume the cross breed would probably exclude females.