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Mar. 14, 2024 After the egg has been fertilized by a sperm, the surrounding egg coat tightens, mechanically preventing the entry of additional sperm and the ensuing death of the embryo, a new study finds. The work ...
Dec. 21, 2021 A 72 to 66-million-year-old embryo found inside a fossilized dinosaur egg sheds new light on the link between the behavior of modern birds and dinosaurs, according to a new ...
May 10, 2021 The process of combining maternal and paternal genetic information is surprisingly ...
July 21, 2023 Scientists show how a fertilized egg cell, or zygote, hits 'reset' so that the newly formed embryo can develop according to its own genetic ...
June 12, 2023 The earliest reptiles, birds and mammals may have borne live young, researchers have ...
Nov. 5, 2021 A new study suggests that early egg introduction is associated with decreased egg ...
Oct. 2, 2023 By genetically testing nearly one thousand embryos, scientists have provided the most detailed analysis of embryo fate following human in vitro ...
Feb. 15, 2024 When the female gametes in plants become fertilized, a signal from the sperm activates cell division, leading to the formation of new plant seeds. This activation can also be deliberately triggered ...
Mar. 29, 2022 Researchers discovered a previously unknown mechanism in roundworms that protects their egg cells from division errors. Uncovering and understanding this hidden mechanism could ultimately lead to new ...
Oct. 12, 2022 A new analysis of old data suggests that the endangered erect-crested penguin's bizarre nesting habits -- rejecting the first egg they lay -- is because they can't feed two chicks, and the ...