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[[File:lighterstill.jpg]][[File:Infertility-51-surrogate.jpg|right|frame]] ...life. Where the life of the family or [[clan]] cannot be continued due to infertility or [[death]], the family of the wife can substitute a [[female]] relative t

...ced by gamete production, fertilisation and carrying a pregnancy to term). Infertility is a deficient fertility.

...d]] by gamete production, fertilisation and carrying a pregnancy to term). Infertility is a deficient fertility.

...[[donkey]]s mating to produce [[mule]]s. Such [[hybrid]]s are generally [[infertility|infertile]], due to the two different sets of chromosomes being unable to p