AI-designed Xenobots reveal entirely new form of biological self-replication—promising for regenerative medicine. To persist, life must reproduce. Over billions of years, organisms have evolved many…
Extraordinary shape makes births more difficult, but guarantees stability. The relatively narrow human birth canal presumably evolved as a “compromise” between its abilities for parturition,…
Egg and sperm cell size evolved from competition. Limited resources drove gametes to differ vastly in size and number. In most living animals, egg cells…
Researchers on quest to understand how different sexes first evolved. For 30 years, University of Tokyo Associate Professor Hisayoshi Nozaki has traveled an hour west…
New University of Arizona research finds that sexual reproduction and multicellularity drive diversity among different species. There are huge differences in species numbers among…
A new study led by an Iowa State University scientist sheds light on how organisms have evolved to address imbalances in sex chromosomes. The study…
University of Maryland scientists discover that match matters: The right combination of parents in nematode worms can turn a gene off indefinitely. Evidence suggests that…
PhD student Sarah Nyquist applies computational methods to understudied areas of reproductive health, such as the cellular composition of breast milk. Sarah Nyquist got her…
A large cohort study drawn from the national IVF registry of France, which included almost 70,000 pregnancies delivered after 22 weeks gestation between 2013 and…
A few males are enough to fertilize all the females. The number of males, therefore, has little bearing on a population’s growth. However, they are…
Sperm size varies dramatically among different animal species. But why is sperm size so variable when they share the same job — to fertilize eggs?…
Male infertility affects more than 20 million men globally and is a contributing cause to around 50% of infertility in couples. Frequently, male infertility is…
It’s a tough time to be a shark. Pollution, industrialized fishing, and climate change threaten marine life, and the populations of many top ocean predators…
An alternative explanation of recent findings of declining sperm counts: normal, non-pathological variation. A new study from the Harvard GenderSci Lab in the journal Human Fertility,…
Exeter scientists have discovered a simple, efficient way to recreate the early structure of the human embryo from stem cells in the laboratory. The new…
The blog “Ladyplanet. Natürlich Frau sein” is quite certain: “Our cycle is linked to that of the moon. The most obvious connection is the length…
More human twins are being born than ever before, according to the first comprehensive, global overview published on March 12, 2021, in Human Reproduction,[1] one…
Oocyte growth relies on physical phenomena that drive smaller cells to dump their contents into a larger cell. Egg cells are by far the largest…