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Sexual conflict in twins: male co-twins reduce fitness of female Soay sheep
Sexual conflict in twins: male co-twins reduce fitness of female Soay sheep | Biology Letters
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Male twins reduce fitness of female co-twins in humans
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Description:Effect of producing same- versus mixed-sex twins on the mother's fitness, measured as the number of grandchildren produced by her offspring controlling for differing numbers of offspring raised to adulthood. Discussion There is increasing evidence that conditions experienced before birth can have profound effects on the subsequent growth, survival, and reproductive capacity of individuals 1 — 8. For example, the prenatal acquisition of hormones from developing neighbors in viviparous animals has been shown to have significant consequences for adult morphology, physiology, and behavior both in mammals 9 , 12 , including humans 11 , 13 — 20 , as well as in viviparous lizards
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