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Articles on Eggs

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Getting the job done. A female Asian water dragon (Physignathus cocincinus) produced a daughter (left) without the assistance of a male. Skip Brown/Smithsonian’s National Zoo

Virgin births from parthenogenesis: How females from some species can reproduce without males

Parthenogenesis, a form of reproduction in which an egg develops into an embryo without being fertilized by sperm, might be more common than you realized.
Yolks are a great source of vitamins, minerals, fats and proteins packaged up by the female animal for an embryo. Emily Nunell/The Conversation CC-NY-BD

Curious Kids: why do eggs have a yolk?

A yolk allows a developing animal to stay in an egg longer, boosting its chance of survival. The downside is the mother has to work hard finding extra food so her body can create a nutritious yolk.
A 12-week-old baby female macaque, named Grady, was born from frozen testicular tissue. Oregon Health and Science University

A new procedure may preserve fertility in kids with cancer after chemo or radiation

Children with cancer not only endure chemotherapy or radiation treatment but they may also face infertility in adulthood. Now a new procedure, just proven in monkeys, may be close to use in humans.

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