Reproduction
Researchers have magnetized cattle sperm using tiny beads, enabling them to be guided by external fields toward an egg. The method formed healthy embryos in lab tests at rates matching standard sperm. It aims to support future in vivo fertilization inside the body.
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Researchers at James Cook University have found that epaulette sharks, also known as walking sharks, lay eggs without any measurable rise in energy use, defying expectations for reproductive costs. The study tracked metabolism, blood, and hormones throughout the sharks' reproductive cycle, revealing remarkable stability. This efficiency could indicate resilience in changing ocean conditions.
A new study reveals that older men pass on significantly more disease-causing genetic mutations to their children due to the rapid proliferation of mutant sperm stem cells. Researchers found that the proportion of mutated sperm rises sharply with age, from 1 in 50 for men in their early thirties to nearly 1 in 20 by age 70. This phenomenon, driven by 'selfish' mutations, heightens risks for severe disorders in offspring.