Being hybrids, Savannahs typically exhibit some characteristics of hybrid inviability.
2.
The Regulatory Hypotheses specifically attributes hybrid inviability in mammals, birds, and frogs to differences in gene regulation.
3.
"' The Immunological Hypothesis "'proposes that the divergence of certain protein structures associated with mother and child causes hybrid inviability.
4.
Wilson et al . ( 1974 ) proposes two hypotheses to explain the relatively faster evolution of hybrid inviability in mammals : the Regulatory and the Immunological Hypotheses.
5.
It proposes that hybrid inviability evolved faster in mammalian taxa because mammals have accumulated significantly more changes in regulatory systems than birds or frogs, and it suggests that organisms with distinctly different systems of gene regulation may not produce viable hybrids.
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