Why do human females tend to have single rather than multiple pregnancies?
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Answers
According to the theory of the selfish gene all genes “want" to propagate themselves at the expense of all other genes, so all fathers, human or otherwise would prefer the female they have just fertilised to have as many babies as possible. This if fine if you are a fish, a bee or a termite. If you are a female, your genes also want to be propogated as much as possible. If you are a female and a mammal esthere are other considerations for your womb can only accommodate a limited number of foetuses before the size and weight will kill both the mogher and the offspring
This problem can be solved by giving birth to the young when they are small and undeveloped. So America opposums and the common housemouse can easily have more than a dozen offspring and so in fact can the dog or the pig.
Explanation:
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