A study from Karolinska Institutet in Sweden, among others, presents the theory that egg-sperm fusion, a crucial feature of sexual reproduction in plants and animals, may have originated from an ...

Sperm and egg cells, or gametes, are unusual. Egg cells are some of the largest cell types, and sperm are some of the smallest. In humans, these haploid cells come together to form diploid cells. It's ...

One species of bacteria seems to get many of the perks of sexual reproduction without actually having sex, a new study finds. Different strains of bacteria called Mycobacterium smegmatis swap large, ...