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…
Posts published in “Reproductive Biology”
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Pleodorina algae float in a water sample under a light microscope. Credit: © Hisayoshi Nozaki, CC BY 4.0 Researchers on quest to understand how different…
The species of turtle involved in the study is Apalone spinifera, a species of freshwater turtles native to North America. But the researchers say their…
Researchers from UMD found that the same gene for expressing a red fluorescent protein is always expressed (ON), when it is inherited from the mother,…
Sarah Nyquist, a PhD student in MIT’s Computational and Systems Biology program, applies computational methods to understudied areas of reproductive health, such as the cellular…
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 mating pair of Callosobruchus maculatus attempting to disengage (female left, male right). Credit: Mareike Koppik A few males are enough to fertilize all the…
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…
A baby bamboo shark born via artificial insemination. Credit: Photo by Jay Harvey, Aquarium of the Pacific It’s a tough time to be a shark.…
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,…
Left is stem cell embryo model; right is nature human embryo. Credit: University of Exeter Exeter scientists have discovered a simple, efficient way to recreate…
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…
Clustered fruit fly nurse cells squeeze their contents into a large egg cell. Credit: Jasmin Imran Alsous Oocyte growth relies on physical phenomena that drive…
These distant primate cousins of humans are among the few mammal species in which male-female partners stick together year after year. Credit: David Haring, Duke…
Heliconius melpomene butterflies mating in captivity in Panama. Credit: Kelsey Byers Butterflies have evolved to produce a strongly scented chemical in their genitals that they…
In warmer waters, shark embryos grew faster and used their yolk sac quicker, which is their only source of food as they develop in the…
Researchers have evaluated for the first time the effect of a short/middle-term consumption of a mixture of tree nuts (almonds, hazelnuts and walnuts) on sperm…
University of Massachusetts Amherst scientists say discovery could lead to better diagnosis of male infertility. Researchers at the University of Massachusetts Amherst have identified a…
Artist’s reconstruction of mating ostracods. Credit: YANG Dinghu Small bivalved crustacean ostracods are the most abundant fossil arthropods since the Ordovician and play an important…