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Meiosis in Biological News

Is this the beginning of the end of plant breeding?

... only half of the parental amount of DNA. meiosis occurs in all species that reproduce sexually, ... introduces. The first steps of both meiosis and mitosis are the replication of the dividing ... X. Thus the differences between mitosis and meiosis are ...

Yeast missing sex genes undergo unexpected sexual reproduction

... learned that forms of Candida yeast undergo meiosis but generate offspring of several types. About ... arise." Heitman said that Candida 's meiosis without meiotic genes may be what gives rise to ... are the unfortunate consequence of undergoing meiosis without the machinery that species normally have ...

Stowers Institute's Hawley Lab identifies factors responsible for restart of meiotic cycle

... females develop during fetal development and begin the actual process of meiosis before birth, but the oocytes remain in a suspended state until the female ... oocyte development is arrested for 3-4 days at exactly the same point in meiosis as in humans. The long period of meiotic arrest has mystified ...

How chromosomes meet in the dark -- Switch that turns on X chromosome matchmaking

... successful. The researchers believe that this newly discovered "thermodynamic switch" not only explains how X chromosomes pair up during meiosis but also apply to a range of other cell processes that involve the recognition and pairing of DNA sequences including other homologous chromosomes. ...

Rong Li Lab probes mechanism of asymmetry in meiotic cell division

... The Stowers Institute's Rong Li Lab has characterized a mechanism that allows for asymmetrical cell division during meiosis in oocytes. By tracking chromosome movement in live mouse oocytes, the team discovered that chromosomes can recruit to their vicinity a protein ...

New clues to how sex evolves

... of the two copies most cells carry. During meiosis a cell replicates and then divides twice, ... eggs with just one set of chromosomes each. For meiosis to work properly, corresponding chromosomes must ... in length, admirably suited to the study of meiosis because it is completely transparent and ...

What controls stickiness of 'smart' chromosomal glue

... pairs of chromosomes at precisely the moment of meiosis ?the specialized cell division process that ... knowledge of the mechanism of cohesin loss during meiosis could ultimately improve understanding of the ... one another's embrace quite differently during meiosis and mitosis. In mitosis, cohesins release ...

One big biology question solved

... an egg or a sperm depends on the time at which meiosis begins," Professor Koopman said. "In females, meiosis begins before birth and eggs are produced, whereas in males, meiosis begins after birth and the result is sperm." ...

Researchers find gene mutation that causes infertility in male mice

... The mutation leads to a change in an amino acid in Dmc1 that blocks meiosis in its tracks, preventing sperm production. The mutant allele (one version ... reports that in some patients, a sequence change in this or other meiosis genes might cause a dominant defect in function, but until now there has ...

Mother birds increase progesterone to hatch females

... of higher-than-normal levels of the hormone progesterone during the first meiosis -- the cell division that divides the sex chromosomes and genetically ... that how much progesterone the female follicle produces during the first meiosis is the mechanism in birds that manipulates the sex ratio of offspring," ...

Early-stage sperm cells created from human bone marrow

... also created spermatagonial cells from mouse bone marrow. The cells were transplanted into mouse testes and were observed to undergo early meiosis - cell division - the next stage to them becoming mature sperm cells, although they did not develop further. Talking about his newly published ...

Mitochondrial genes move to the nucleus -- but it's not for the sex

... pollen, via meiosis. But the mating system determines whether or not this separation is permanent. With self-pollination, the components separated by meiosis are brought back together. In contrast, the components are further separated if they mix and match haphazardly during out-crossing. Brandvain ...

Scientists discover role for dueling RNAs

... in haploid cells because they continually produce IME4 antisense RNA, blocking the production of sense RNA. Antisense IME4, then, safeguards against meiosis in cells that can't handle it. "This is the first time that we've found a function for antisense RNA, that is not RNAi, in a higher cell ...

Needling Chromosomes Reveals Cell Division Secret

... operates in normal cell division, called mitosis, as well as the proliferation of sperm and egg cells called meiosis. "Chromosomes in mitosis and meiosis have to be held together, because otherwise they don’t attach to the apparatus called the spindle that distributes them to opposite poles," explained ...
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