kleefarr
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When a male lion mates with a tigress, his genes promote large offspring because lions are adapted to a competitive breeding strategy. The tigress does not inhibit the growth because she is adapted to a non-competitive strategy. Therefore the offspring (liger) grows larger and stronger than either parent because the effects do not cancel each other out. In contrast, when a male tiger mates with a lioness, his genes are not promoting large growth of the offspring because he is not adapted to a competitive breeding strategy. However, the lioness is adapted to a competitive strategy and her genes still inhibit the growth of the developing cubs. This uneven match means that the offspring (tigons) are often smaller and less robust than either parent.