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meiotic in Medical News

Human sperm created from embryonic stem cells

...ers which are specific to primordial germ cells, spermatogonial stem cells, meiotic (spermatocytes) and post meiotic germ cells (spermatids and sperm). These results indicated maturation o...

Bread mold may hold secret to eliminating disease-causing genes

...n). The finding could have implications for higher organisms and may lead to precise targeting of unwanted genes, such as those from the HIV virus. meiotic silencing also occurs in worms, mice and human beings, said Patrick Shiu, assistant professor of biological sciences in the MU College of Arts and Sci...

Penn researchers identify first sex chromosome gene involved in meiosis and male infertility

...esearchers found that TEX11 forms discrete foci on meiotic chromosomes and appears to be a novel constituent of the meiotic recombination machinery. The team genetically eng... and may provide a physical link between these two meiotic processes. ...

No Evidence Older Women Generate New Eggs

... evidence to support his hypothesis that women may generate new eggs after birth. The USF researchers searched for markers of stem cells or of meiotic cell division in ovarian cells biopsied from 12 women between the ages of 28 and 53. Despite using the most sensitive methods available, we fo...
meiotic in Medical Technology

CRi Oosight(TM) Instrument Crucial in IVF Breakthrough Demonstrating a Correlation Between Non-Invasive Egg Metrics and Pregnancy

...in Amsterdam June 28 to July 2 in the Research Instrument's booth (number 95). Oosight systems produce non-invasive, high-contrast images of the meiotic spindle and zona pellucida without the need for potentially harmful dyes or stains. In addition, these images contain quantitative data that indicate ...
meiotic in Biological News

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 called formin-2. This protein ...

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

The Stowers Institutes Hawley Lab has identified a pair of proteins that work in concert to restart the meiotic cycle of oocytes following a natural period of dormancy. The Hawley Lab has described the dual actions of these two proteins as the Sleeping Beauty Kiss that awakens the long-dorman...

Is this the beginning of the end of plant breeding?

...erimentally combined. These divisions are normally meiotic which make pollen and egg cells and are replaced...ice, without the lottery of reassortment that each meiotic division and ensuing fertilization introduces. ...s homologous pairs of chromosomes while the second meiotic division is just like the mitotic di vision: the c...

Yeast missing sex genes undergo unexpected sexual reproduction

...said. "This provides a new way to study sexual reproduction and how chromosomal abnormalities arise." Heitman said that Candida 's meiosis without meiotic genes may be what gives rise to the progeny with unusual numbers of chromosomes. "Or maybe the genes were lost for a reason, to provide a route to gen...

Small RNAs can play critical roles in male infertility/contraception

...nd also in sperm formation. "The sex chromosome silencing in meiotic male germ cells is a well-known phenomenon, which has been termed meiotic sex chromosome inactivation. I was surprised when we first observed that nu...

Oosight microscope enables embryonic stem cell breakthrough

...says. The Oosight allowed Mitalipovs team to clearly see and remove the meiotic spindle (and the attached genetic material) from 304 female rhesus monkey e... components of the cell, which led to his landmark discovery in 1951 of the meiotic spindle fibers in living cells. He later showed that dynamic disassembly of...

New clues to how sex evolves

..., and the process of meiosis can be observed at every stage, as chromosomes first come together during the pairing process, then later separate during meiotic division. One result of failed pairing of X chromosomes is a high incidence of males having only one X chromosome. The observation that a mutant ...

Scientists discover role for dueling RNAs

...rger cells from which they originate. But in some cases, flipping the meiotic switch can be catastrophic. If a cell with only one copy of each chromosome...rced into meiosis, the progeny won't survive. Fortunately, such destructive meiotic division is avoided in haploid cells because they continually produce IME4 ...

What controls stickiness of 'smart' chromosomal glue

...the initial removal of cohesin from the chromosome arms, they found. In meiotic recombination, after each member of a chromosome pair has replicated to pro...lutely essential to remove cohesins from chromosome arms during the initial meiotic stages, and if you don't have recombination that does not happen properly."...

New egg freezing technique offers hope to hundreds of women

...freeze-thawing, in particular to a part called the meiotic spindle which is involved in cell division. The meiotic spindle is a bundle of microtubules, some of which...mosomal movement. "Before freezing we observed meiotic spindles in 62.5% of oocytes, but in only 43.4% af...
meiotic in Biological Definition

Cell growth

...licated its DNA. These two types of cell reproduction produced two daughter cells that have the same number of chromosomes as the parental cell. After meiotic cell reproduction the four daughter cells have half the number of chromosomes that the parental cell originally had. This is the haploid amount of D...

Meiosis

... article is defined in the article on mitosis .) As described earlier, meiotic nuclear division consists of two stages, called meiosis I and meiosis II...s of a sister chromatid pair, as aforementioned. Telophase The first meiotic division effectively ends when the centromeres arrive at the poles. Each da...

Polymerase chain reaction

...ain alleles at 2 or more SNPs occur together on the same chromosome [Linkage Disequilibrium]) or detection of recombinant chromosomes and the study of meiotic recombination. Comparison of gene expression Researchers have used traditional PCR as a way to estimate changes in the amount of a gene's ex...

Spermatogenesis

...togonia become primary spermatocytes . Primary spermatocytes go through a meiotic division to become secondary spermatocytes , which undergo another meiotic division to become spermatids . Type A spermatogonia stay as spermatogoni...

Zygote

... a single diploid cell called the zygote . Animal zygotes undergo mitotic cell divisions to become an embryo . Other organisms may undergo meiotic cell division at this time (for more information refer to biological life cycles ). Twins and multiple births can be monozygotic (identical)...
meiotic in Biological Dictionary

Unlinked

... her ancestors as an unlinked , separate, small database within the ... meiotic Recombination Between Unlinked Genes Animation ... Loading... More Biology Animations. meiotic Recombination Between Unlinked Genes. 2D Flash Animation ... When spec...

Synaptonemal complex

... BioInfoBank Library :: Synaptonemal Complex :: Changes in crossover distribution ... ZIP1 is a synaptonemal complex protein required for meiotic chromosome synapsis. ... ... synaptonemal complex formation. Definition. The cell cycle process whereby the synaptonemal ... GO:0007130 :...

Secondary oocyte

...nd then to an ... Each oocyte finishes its first meiotic division, creating a secondary oocyte and ... The secondary oocyte begins the second meiotic division, but the process stops in metaphase. ... ... ... The secondary oocyte begins the second meiotic division, but the process stops in metaphase. ... ...

Recombination nodules

...se nodules could represent the early recombination nodules of earlier meiotic ... Recombination probably occurs in structures called recombination ...otene bivalents from plants. ... Homologous chromosome synapsis and meiotic recombination are facilitated by several meiosis-specific structures: the...

Recombination frequency

...In eukaryotes recombination occurs in mitosis as a common mechanism of DNA repair and in... ... influence the frequency and distribution of meiotic recombination events within ... sequence features and recombination frequency variation in the NID1 ... Zoology information, history, art...

Recombination

...nce of the gene ... A creation science resource megasite where you can find an assortment of free curriculum, participate in discussion ... that meiotic recombination is not the ... Recombination summary with 11 pages of encyclopedia entries, essays, summaries, research information, and more. .....

Primary oocyte

... ... follicle consists of a primary oocyte surrounded by a layer of ... An oocyte is considered primary if it has not yet undergone its first meiotic division. ... Medical definition for the term ' primary oocyte ' ... Medical Dictionary - ' Primary Oocyte ' How to search: 1. Enter ... prima...

Post-meiotic segregation

... Anti- Post meiotic Segregation Increased 2. Species Reactivity. Key Applications. Host ... Anti- Post meiotic Segregation Increased 2 - Data Sheet ... Anti- Post meiotic Segregation Increased 2 - Data Sheet. Catalogue...

Polytene

...ed by repeated replication during synapsis ... Draw the polytene chromosomes as you see them under the microscope. ... Drosophila genetics: meiotic mapping and polytene chromosomes ... Polytene chromosomes in the Drosophila salivary glands have distinctive banding patterns. ... Subs...

Polyploid

... from the pairing of meiotically ... Polyploid organisms contain two or more sets of chromosomes. ... Figure 3: Polyploid formation and ensuing meiotic and mitotic irregularities. ... Definition of polyploid from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of ...
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