In a scientific first, researchers from the US and the UK have taken early-stage human egg cells and grown them to full maturity in the lab. It's an important proof-of-concept that could eventually yield new infertility treatments for women.
Tagged With meiosis
You may have learned in school that humans have 23 pairs of chromosomes: Twenty-two "autosomes" and their partners, which contain pretty much the same genes and in the same order, plus one pair of sex chromosomes that lead to the differentiation in sexual traits. But enough about us. The Amazonian Leptodactylus pentadactylus (smoky jungle frog) has six pairs of sex chromosomes.