All sperm are not created equal. Some contain abnormal numbers of chromosomes which can trigger miscarriages or lead to conditions such as Down’s syndrome if they manage to fertilise an egg.
“The method produced a 20-fold decrease in the frequency of sperm with abnormal numbers of chromosomes”
Healthy sperm usually outcompete abnormal sperm in the arduous race to the egg, but an increase in the use of IVF techniques such as intracytoplasmic sperm injection (ICSI), in which a sperm is injected into an egg, has improved their chances. “The presence of a single sperm makes ICSI possible,” says Ulrik Kvist…
