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meiotic in Medical News

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

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

Human sperm created from embryonic stem cells

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

Bread mold may hold secret to eliminating disease-causing genes

... 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 ...

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 ...
meiotic in Medical Technology

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

... 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 Medical Dictionary

Organ

... organ ; ... The spindle pole body is the microtubule- organ izing center in this cell , organ izing all of the microtubules of the mitotic and meiotic spindles, and is therefore the yeast equivalent of the centrosome found in vertebrate cells. Carcinoma A type of cancer that starts in the ...
meiotic in Biological News

Is this the beginning of the end of plant breeding?

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

Rong Li Lab probes mechanism of asymmetry in meiotic cell division

... drives chromosome movement in mammalian meiotic oocytes," said Hongbin Li, Ph.D., Senior Research ... are often related to problems during oocyte meiotic cell divisions," said Rong Li, Ph.D., ... toward a better understanding of the process of meiotic divisions and how actin generates the force to ...

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

... of proteins that work in concert to restart the meiotic cycle of oocytes following a natural period of ... in organisms like humans, but shorter periods of meiotic arrest can be found in simpler, more easily ... in meiosis as in humans. The long period of meiotic arrest has mystified biologists for over a ...

Small RNAs can play critical roles in male infertility/contraception

... 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 ...

Oosight microscope enables embryonic stem cell breakthrough

... The Oosight allowed Mitalipovs team to clearly see and remove the meiotic spindle (and the attached genetic material) from 304 female rhesus monkey ... 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 ...

Yeast missing sex genes undergo unexpected sexual reproduction

... "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 ...

New egg freezing technique offers hope to hundreds of women

... 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 ... movement. "Before freezing we observed meiotic spindles in 62.5% of oocytes, but in only 43.4% ...

Scientists discover role for dueling RNAs

... 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 ... 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

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

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 ...

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meiotic in Biological Definition

Meiosis

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

Spermatogenesis

... 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 ...

Cell growth

... 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 ...

Polymerase chain reaction

... 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 ...

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 ...

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meiotic in Biological Dictionary

Secondary oocyte

... 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. ... ...

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. ...

Heteroduplex Dna

... essays, summaries, ... Heteroduplex DNA in meiotic Recombination in Drosophila mei-9 Mutants ... Heteroduplex DNA in meiotic Recombination in Drosophila mei-9 Mutants summary ... Research, Free Preview: ' Heteroduplex DNA in meiotic Recombination in ... Heteroduplex , Dna ...

Diplotene

... ) ( cell and molecular biology ) The stage of meiotic prophase during which pairs of nonsister ... /dip·lo·tene/ (-tēn) the stage of the first meiotic prophase, ... diplotene . dipluran. dipody. ... /dip·lo·tene/ (-tēn) the stage of the first meiotic prophase, ... diplotene : Definition and ...

Unlinked

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

Recombination nodules

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

Leptotene

... ( ′leptə′tēn ) ( cell and molecular biology ) The first stage of meiotic prophase, when the chromosomes appear as thin threads having ... a free online dictionary ... relating toor being the leptotene of meiotic prophase ... Information about leptotene in the free online English ...

Gene conversion

... in DNA genetic recombination, which occurs at high frequencies during meiotic division but which also occurs in somatic cells. It is a process by ...m... Gene conversion is a phenomenon in which the products of a meiotic division in ... I think gene conversion is not an ERROR, but ...

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 ...

Recombination frequency

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

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