Japanese  
  Home  |  Top News  |  Most Popular  |  Video  |  Multimedia  |  News Feeds  |  Feedback
  Medicine  |  Nature & Earth  |  Biology  |  Technology & Engineering  |  Space & Planetary  |  Psychology  |  Physics & Chemistry  |  Economics  |  Archaeology
Top > Biology >
Sex, Tools And Chromosomes

Published: April 12, 2012.
By University of California - Davis
http://www.ucdavis.edu

Summary

Researchers at the University of California, Davis have discovered a key tool that helps sperm and eggs develop exactly 23 chromosomes each.

During meiosis, the cell division process that creates sperm and eggs, matching chromosomes pair up and become connected by "crossing over" with each other, said Neil Hunter, a professor of microbiology at UC Davis and senior author of the new study.

These connections are essential for precise chromosome sorting and the formation of sperm and eggs with exactly the right numbers of chromosomes.

Hunter, graduate students Kseniya Zakharyevich and Shangming Tang and research associate Yunmei Ma, looked for enzymes that could cut DNA to form crossovers in yeast, which form sexual gametes, or spores, in much the same way that humans and other mammals form sperm and eggs.


Read Full Story »

Keywords

Crossovers, Chromosomes, Hunter, Enzymes, Dna, Sperm, Role, Pair, Form, Eggs, Cut, Yeast, Step, Play, Meiosis, Humans, Essential, Davis, Crossover, Chromosome, …

Cluster Centroids (Superclass Keywords)

Chromosome, Chromosomes, Genes, Sex, Page, Chromosomal, Fertility, Genetic, Rearrangements, Cotton, Crossovers, Ramsey, Species, Males, Stelly, Sperm, Evolution, Complement, Evolutionary, Rdna, Inactivation, Regions, Breeds, Polyploidy, Autosomes, Savii, Italian, Canid, Lost, Determination, Karr, Gene, Dna, Humans, Mutations, X-Chromosome, Inheritance, Beneficial, Hexaploid, Recombination, Cytogenetics, Expression, Bovine, Xxx, Females, …

Show articles in this group »


More news from University of California - Davis


Stress-tolerant Tomato Relative Sequenced
28 July 2014
NMR Under Pressure: Reproducing Deep-Earth Chemistry
11 July 2014
Die-offs of Band-tailed Pigeons Connected to Newly Discovered Parasite
02 July 2014
Invasive Watersnakes Introduced to California May Pose Risk to Native Species
26 June 2014
Does 'Free Will' Stem from Brain Noise?
09 June 2014
When Eradicating Invasive Species Threatens Endangered Species Recovery
29 May 2014
With Climate Changing, Southern Plants Outperform Northern
20 May 2014
Related »

Chromosome 
5/14/14 
★★ 
Evolutionary Biologists Glimpse Early Stages of Y-chromosome Degeneration
By University of Toronto
TORONTO, ON – In many species, the possession of X and Y chromosomes determines whether an individual develops into a male or female. In humans, for example, individuals who …
Chromosomes 
6/17/14 
★ 

UT Arlington Scientists Suggest 'Fragile Y Hypothesis' to Explain Chromosome Loss
By University of Texas at Arlington
Chromosomes 
8/11/12 

Study of Fruit Fly Chromosomes Improves Understanding of Evolution And Fertility
By Arizona State University
Beneficial 
1/30/12 
Development of the Chimpanzee Determined by the X Factor
By Aarhus University
One of the most important questions for evolution researchers is how a species develops and adapts during the course of time. An analysis of the genes of twelve chimpanzees …
Chromosome 
7/21/11 
Chromosome Number Changes in Yeast
By Public Library of Science
Researchers from Trinity College Dublin have uncovered the evolutionary mechanisms that have caused increases or decreases in the numbers of chromosomes in a group of yeast species during the …
Sex 
8/19/11 
B Chromosomes Affect Sex Determination in Cichlid Fishes
By Public Library of Science
B chromosomes have a functional effect on sex determination in a species of cichlid fishes from Lake Victoria, according to a study by Japanese researchers to be published in …
More » 
 
ScienceNewsline  |  About  |  Privacy Policy  |  Feedback  |  Mobile  |  Japanese Edition
The selection and placement of stories are determined automatically by a computer program. All contents are copyright of their owners except U.S. Government works. U.S. Government works are assumed to be in the public domain unless otherwise noted. Everything else copyright ScienceNewsline.