I can understand arrest of recombination (in sexual chromosomes for example) caused by a chromosome inversion. In which case, it seems to me that only heterozygous (the two chromosoms have sequences ...
The majority of animals have two genders, and both are needed in reproduction. It seems like it would be more advantageous for creatures to be hermaphrodites, since they could mate with any member of ...
According to Wikipedia: In biology, a cryptic species complex is a group of species which satisfy the biological definition of species—that is, they are reproductively isolated from each ...