Parental investment and sex differences in juvenile mortality in birds and mammals

Abstract

The common finding that juvenile male mammals show higher mortality than females1,2 is usually attributed either to the expression of deleterious recessive alleles on the X chromosome3 or to adaptive manipulation of the postnatal sex ratio by mothers who are unable to rear successful sons4,5. As a general explanation of differential juvenile mortality, the… (More)
DOI: 10.1038/313131a0

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