Men sperm count crisis: Scientists find 50 per cent drop in sperm quality linked to maternal smoking during pregnancy, obesity and poor diet
What’s driving this downward spiral? Scientists may not agree on a single cause, but the evidence consistently points to a cluster of culprits: maternal smoking during pregnancy; obesity and poor diet; heavy metal exposure; and the relentless rise of environmental toxins and endocrine disruptors.
Scientists at Oregon Health and Science University create human eggs from skin cells, use them to form embryos
In Dolly’s case, sperm from a father was not used. But for the Oregon team, the goal was to make embryos with genetic material from both parents. A normal sperm and egg have 23 chromosomes each, with a healthy embryo containing 46 chromosomes.
