How similar must two species be for one to carry the fetus of another?

Subject: How similar must two species be for one to carry the fetus of another?

Date: Sun Jan 27 00:56:24 2002
Posted by Ian
Grade level: nonaligned School: No school entered.
City: Seoul State/Province: Kyunggi Country: Korea
Area of science: General Biology
ID: 1012110984.Gb

Message:


I was watching a TV show on the future of cloning pets.  My questions is 
whether one species could carry the fetus of another. Could a dog carry a 
kitten or vice versa?  Would the parent have to be of the same species 
entirely?  I've heard of plans using some species to carry other extinct 
species to term, so some interspecies reproduction must be possible.  To what 
degree would the animals need to be similar?
Thanks.

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