Men have nipples because of a quirk in how embryos develop. But that’s only part of the story of this seemingly redundant body part.
How embryos develop, evolution and sexual pleasure all help explain why men have nipples. But ‘man boobs’ are a different story.
Ethical frameworks, rules, laws: all try to have their say.
CRISPR technology could have momentous effects if it's used to edit genes that will be inherited by future generations. Researchers and ethicists continue to weigh appropriate guidelines.
When it comes to reproduction, couple have more choices than ever before.
A ban on clinical trials involving gene editing rules out the controversial procedure done in China. But it also prevents procedures that could offer couples a chance for healthy children without genetic disorders.
He Jiankui claims he helped make the world’s first genetically edited babies: twin girls whose DNA he said he altered.
AP Photo/Mark Schiefelbein
News of the gene-edited babies excludes images of the children's mother. Cutting her out of the picture underscores the idea that the mother is obsolete and babies can be created in the lab.
Possible causes of limb malformations in babies born in rural areas of France.
Faces form during the very early stages of embryology.
Problems in facial development can occur with the skull, face, blood vessels, muscles, jaws and teeth. But it's the hard palate forming the roof of your mouth that's most commonly affected.
An embryologist pulls out frozen embryos and egg cells.
A recent ruling in an Ontario court fails to consider law governing the use of embryos.
When a cell divides, mitochondria are randomly allotted to the resulting new cells.
Odra Noel. Wellcome Images
The genes in our cells' mitochondria are passed on in a different way than the vast majority of our DNA. New studies shed light on how the unique process isn't derailed by mutations.
She’ll be more like me than you.
Parents' DNA try to manipulate one another in a bid to shape junior in their mould.
With all these ‘test-tube babies’ grown up, how have our reactions to the technology evolved?
AP Photo/Alastair Grant
Americans have moved on from worrying about ‘test-tube babies’ – but there are still ethical challenges to resolve as reproductive technologies continue to advance.
There’s still a way to go from editing single-cell embryos to a full-term ‘designer baby.’
The news may have come as a surprise, but it probably shouldn't have. A bioethics expert walks through how big a deal this announcement is – and what we should be considering now.
She must have had a successful pregnancy.
A new evolutionary perspective on what's been a medical paradox: Why does the body use inflammation to regulate aspects of pregnancy when inflammation is also a big threat to pregnancy?
Developing lizard embryo beneath placental tissues.
Taking the placenta as a case study, researchers are able to piece together how new organs evolve, by repurposing old tissues and using them to do new jobs.
Well hello, Dolly.
Photo courtesy of The Roslin Institute, The University of Edinburgh.
In 1997, scientists announced they'd created a healthy sheep cloned from another ewe's mammary gland cell. Two decades on, the technique is being refined and applied to new challenges.
Preconception planning focuses on improving the health of parents to lower the risk of obesity in children.
If you're planning to become a parent, better lifestyle habits can reduce the risk of obesity in your children.
Opinions differ on the precise moment at which the human embryo attains moral status.
Stem-cell scientists have to work within many limitations placed on their research. One of these is the 14-day rule that outlaws research on pure human embryos over two weeks old.
PHOTOCREO Michal Bednarek/Shutterstock.com
It's a landmark case but there are many unknowns.
Almost half of pregnant women in Australia said they drank alcohol before they knew they were pregnant.
Recent animal studies show the developing embryo is highly susceptible to environmental changes and the actions of the mother in early stages of pregnancy.
There’s a battle for resources going on in there.
Embryos greedily want more resources than their fair share. New research investigates how early in evolution their hormonal tactics arose.
A mouse embryo, like this one, looks a lot like that of a fish, a frog or a human at a certain point in its development.
Scientists have discovered the genetic "switch" that causes many animals, including fish, frogs and humans, to look the same at a certain point in embryonic development.