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reproduction

An egg

Life

Eggs get less fertile with age because of chaotic cell division

Mouse experiments suggest disordered cell division makes eggs become less viable as females age, hinting there might be a way to counteract this in women

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Hands of parents and a baby

Health

Questions raised over 3-parent baby procedure last year

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guppies

Life

Female fish with bigger brains choose better mates

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lamprey

Life

Female fish mate 200 times but save eggs for the perfect male

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abortion protests

Health

Women's access to birth control and abortion fading under Trump

Insight

A juvenile zebra shark

Life

Female shark learns to reproduce without males after years alone

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Exclusive: Mexico clinic plans 20 'three-parent' babies in 2017

Health

Exclusive: Mexico clinic plans 20 'three-parent' babies in 2017

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Mosquito fish

Life

Longer ‘penis’ drives evolution of bigger brains in female fish

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Baby

Health

UK’s first three-parent babies likely to be conceived in 2017

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Male Manogea porracea with egg sacs

Life

The devoted spider dads who fix up nurseries for their babies

Male spiders from Brazil build dome-shape homes, fix silk nurseries and actively defend their offspring – a unique behaviour among solitary spiders

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Life

Mice’s love songs go wrong when ‘language gene’ is messed up

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Life

Eggs made from skin cells in lab could herald end of infertility

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Health

Older women have babies with fewer birth defects after IVF

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Health

Exclusive: ‘3-parent’ baby method already used for infertility

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