Quantcast

Latest Asexual reproduction Stories

affa91e874d97f1077e58eb8c93341ef1
2010-01-25 10:55:43

Shark pups born to virgin mothers can survive over the long-term, according to new research published Jan. 25, 2010 in the Journal of Heredity. The study shows for the first time that some virgin births can result in viable offspring. Genetic analysis led by a Field Museum scientist working with numerous colleagues has confirmed the first known case of a virgin female shark producing multiple offspring that survived. Two daughters of the white-spotted bamboo shark are now more than five years...

2010-01-22 00:55:51

Living organisms have good reason for engaging in sexual, rather than asexual, reproduction according to Maurine Neiman, assistant professor of biology in the UI College of Liberal Arts and Sciences and researcher in the Roy J. Carver Center for Genomics. In an article published in a recent issue of the journal Molecular Biology and Evolution, she and her colleagues, including John M. Logsdon Jr., associate professor of biology, examined the theory that sexual reproduction, while requiring...

2009-07-13 17:13:32

Why do some plants defend themselves from insect attacks better than others? New evidence shows that the difference might be due to whether they're getting any plant love.In research published in Proceedings of the National Academy of Sciences, scientists from North Carolina State University and Duke University discovered that sexually produced evening primrose plants withstand attacks from plant-eaters like caterpillars better than plant relatives that reproduce by themselves.The findings...

9bd1876d0aae3cf81ae01d5c491af2ea1
2009-04-15 15:05:00

A species of tropical ant appears to have done away with sex altogether. Instead, the ants now only produce females through a process of cloning. These Mycocepurus smithii ant species have been discovered as the first ever to reproduce without sex, said researchers in the journal Proceedings of the Royal Society B. Anna Himler, a biologist from the University of Arizona's Center for Insect Science led the study in which researchers used "fingerprinting" DNA to show that each ant was in fact a...

fcb9b995bbaa34b1508489b534dfb9821
2009-03-27 09:43:01

Asexual reproduction results in more babies, less inbreeding Scientists at North Carolina State University and three universities in Japan have shown for the first time that it is possible for certain female termite "primary queens" to reproduce both sexually and asexually during their lifetimes. The asexually produced babies mostly grow to be queen successors "“ so-called "secondary queens" "“ that remain in the termite colony and mate with the king. This produces large broods of...

248bb81904c14b9592254d83d7b8044c1
2008-11-26 09:51:09

The utility of sex, according to an intriguing new theory of evolutionary biology, may be its ability to promote genes that play well with many other partners rather than those that shine with just one specific set of genes. This idea of genetic mixability, described in the journal Proceedings of the National Academy of Sciences the week of Nov. 24, hits on the difficulty evolutionary biologists have had in understanding sex, specifically its role in population genetics and Darwin's...

f9e7fe991c166ab46d724e650ccfb7d31
2008-10-10 15:25:00

The second-known instance of "virgin birth" in a shark has been confirmed through DNA testing, scientists said. A pup carried by a female Atlantic blacktip shark named Tidbit in the Virginia Aquarium & Marine Science Center contained no genetic material from a male. Beth Firchau, the curator of fish at the Virginia Aquarium & Marine Science Center in Virginia Beach said Tidbit was born in the wild and lived there for eight years with no males of the same species. The first documented...

2007-07-03 09:17:00

By Crawford, Terry J Crawford, Bruce J Abstract: In Rarotonga, Linckia multifora (Lamarck) exists in two forms: a blue gray type that is found on the reef intertidally and a red form that is found subtidally. Both types reproduce asexually by regeneration of autotomized arms, as well as sexually, but the relative potential for sexual reproduction varies greatly between these different sites. In the laboratory, reciprocal crosses of the blue gray intertidal form and the red subtidal form...

948af1beb68d412ebf57b413418d984c1
2007-06-25 15:10:00

NORFOLK, Va. -- Veterinarian Bob George sliced open the dead shark and saw the outline of a fish. No surprise there, since sharks digest their food slowly. Then George realized he wasn't looking at the stomach of the blacktip reef shark, but at her uterus. In it was a perfectly formed, 10-inch-long shark pup that was almost ready to be born. George was dumbfounded. He had been examining the shark, Tidbit, to figure out why she reacted badly to routine sedatives during a physical and died,...

70deb53a90ad86c8bb1cab7f8798ae101
2007-05-22 19:25:00

DUBLIN, Ireland -- Female sharks can fertilize their own eggs and give birth without sperm from males, according to a new study of the asexual reproduction of a hammerhead in a U.S. zoo. The joint Northern Ireland-U.S. research, being published Wednesday in the Royal Society's peer-reviewed Biology Letter journal, analyzed the DNA of a shark born in 2001 in the Henry Doorly Zoo in Omaha, Neb. The shark was born in a tank with three potential mothers, none of whom had contact with a male...


Word of the Day
jument
  • A beast of burden; also, a beast in general.
'Jument' ultimately comes from the Latin 'jugum,' yoke.
Related