Related topics: sperm · fertilizer · offspring · birds · embryos

The growth of an organism rides on a pattern of waves

When an egg cell of almost any sexually reproducing species is fertilized, it sets off a series of waves that ripple across the egg's surface. These waves are produced by billions of activated proteins that surge through ...

Egg stem cells do not exist, new study shows

Researchers at Karolinska Institutet in Sweden have analyzed all cell types in the human ovary and found that the hotly debated "egg stem cells" do not exist. The results, published in Nature Communications, open the way ...

Worms discovered in the brain of lizard embryos for the first time

Researchers have discovered nematodes, or worms, in the brains of lizard embryos. This is the first time they have been found in reptile eggs, and it was previously believed that egg laying prevents parasites from being transmitted ...

The paradox of dormancy: Why sleep when you can eat?

Why do predators sometimes lay dormant eggs, which are hardy, but take a long time to hatch and are expensive to produce? That is the question that researchers from Singapore University of Technology and Design (SUTD) set ...

Neutron source enables a look inside dino eggs

Did the chicks of dinosaurs from the group oviraptorid hatch from their eggs at the same time? This question can be answered by the length and arrangement of the embryo's bones, which provide information about the stage of ...

Jumping genes threaten egg cell quality

A woman's supply of eggs is finite, so it is crucial that the quality of their genetic material is ensured. New work from Carnegie's Marla Tharp, Safia Malki, and Alex Bortvin elucidates a mechanism by which, even before ...

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