Steps That Enable Human Stem Cells to Develop Into Egg Cells

Human egg cell in the womb

The exact causes of infertility, which can affect around 10% of couples, are often unknown. In some cases, it may be a result of the body’s inability to produce viable gametes. A new study of the development of germ cells from humans could help scientists learn how to create them in the laboratory.

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Homosexual Behavior Among Fish Increases Attractiveness to Females

homosexual-fish-mollies

In many species, females are attracted to large, conspicuous males. But among animals that mate with many partners, males that manage to mate with more than one female can increases their chances of attracting others, even if they aren’t as conspicuous.

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Lab-Made Mouse Oocytes Produce Fertile and Viable Offspring

viable-mice-pups

Japanese scientists have been able to coax mouse stem cells into becoming viable eggs that were able to produce healthy offspring. This will provide a powerful tool to study the basic elements of mammalian development and infertility.

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Lens-Free System Shows Spiraling Swimming Pattern of Human Sperm

sperm-microscope-image

A new three-dimensional imaging technique has shown the spiraling movements that human sperm accomplishes while swimming. Previously, these movements had only been inferred from two-dimensional data.

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Birth Ratios Skew Towards More Females During Famine

chinese-mother-with-girls

In China, during the Chinese Great Leap Forward famine, the male to female birth ratios fell significantly. This implies that whenever food is in short supply, women are more likely to bear daughters than sons.

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