Generational Conflict between Unrelated Childbearing Women Affects the Child’s Survival

Menopause-Lane

Menopause affects humans, pilot whales and killer whales. These are the only organisms on Earth that stop being able to reproduce long before their lifespan is over. In evolution, passing on genes is one of the main reasons for living, which indicates that it’s difficult to find a reason for menopause.

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Birth Ratios Skew Towards More Females During Famine

chinese-mother-with-girls

In China, during the Chinese Great Leap Forward famine, the male to female birth ratios fell significantly. This implies that whenever food is in short supply, women are more likely to bear daughters than sons.

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