In most living animals, egg cells are vastly larger than sperm cells. In humans, for example, a single egg is 10 million times the volume of a sperm cell.
Evolution
Apr 16, 2021
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51
Making gametes such as sperm and eggs from pluripotent stem cells—primitive cells that can make all the tissues—greatly contributes to efficient reproduction of livestock animals and future assisted reproductive medicine. ...
Biotechnology
Mar 02, 2021
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4
Producing fewer sperm cells can be advantageous in self-fertilizing plants. An international study led by the University of Zurich identified a gene in the model plant Arabidopsis that reduces the amount of pollen. In addition ...
Plants & Animals
Jun 08, 2020
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20
Through clever partner selection, animals can increase the future success of their offspring. With some species, this process continues even after the sex act. Researchers at the Max Planck Institute for Evolutionary Biology ...
Evolution
Oct 01, 2018
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36
The varied sex lives of a type of green algae have enabled a University of Adelaide researcher to test a theory of why there are males and females.
Evolution
Nov 29, 2017
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7
Researchers from the Stowers Institute for Medical Research in collaboration with Fred Hutchinson Cancer Research Center researchers have identified an unprecedented genetic survival strategy that would be right at home in ...
Biotechnology
Jun 20, 2017
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812
University of East Anglia scientists have revealed how females select the 'right' sperm to fertilize their eggs when faced with the risk of being fertilized by wrong sperm from a different species.
Evolution
Aug 16, 2013
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0
There's a very confusing exchange in Lewis Carroll's Through the Looking Glass: "When I use a word," Humpty Dumpty said, in rather a scornful tone, "it means just what I choose it to mean—neither more nor less."
Biotechnology
Apr 01, 2013
2
0
(Phys.org)—A research team from the University of California has identified two reprogramming events that occur during the development of oocytes and sperm leading to the formation of gametes in humans. In studying aborted ...
Researchers at the University of California, Davis have discovered a key tool that helps sperm and eggs develop exactly 23 chromosomes each. The work, which could lead to insights into fertility, spontaneous miscarriages, ...
Cell & Microbiology
Apr 12, 2012
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