Web Results

en.wikipedia.org/wiki/Bivalent_(genetics)

A bivalent, sometimes referred to as a tetrad, is the association of a pair of homologous chromosomes physically held together by at least one DNA crossover. This physical attachment allows for alignment and segregation of the homologous chromosomes in the first meiotic division. ... The formation of a bivalent occurs during the first division of meiosis (in the ...

anthro.palomar.edu/biobasis/bio_3.htm

drawing of homologous chromosomes separating in the production of sex cells ... This is trillions of times more combinations than the number of people who have ever ... While homologous pairs of chromosomes are independently assorted in ... During the first division of meiosis, sections near the ends of chromosomes ...

www.ncbi.nlm.nih.gov/pmc/articles/PMC3674063

Apr 10, 2013 ... The first meiotic division with the separation of chromosomes is named ... Prior to entry into meiosis I, homologous chromosomes (originating from each parent) pair and ... It is during meiosis II, and only then, that centromeric cohesion is ... SAC control please refer to existing excellent reviews in refs. and).

www.ncbi.nlm.nih.gov/pmc/articles/PMC4214429

Oct 8, 2014 ... During meiotic divisions in species with monocentric chromosomes ... Holocentric chromosomes are found in certain independent eukaryotic lineages2,3,4,5,6,7. ... are joined together and then separate from each other at anaphase II. ... When the three homologous chromosome pairs are discernible at ...

courses.lumenlearning.com/suny-biology1/chapter/chromosomal-basis-of-inherited-disorders

A human male would have an XY chromosome pair instead of the XX pair shown. ... In a given species, chromosomes can be identified by their number, size, ... cells (like white blood cells) are first collected from a blood sample or other tissue . ... If homologous chromosomes fail to separate during meiosis I, the result is two  ...

www.ansci.cornell.edu/usdagen/dictionary.html

chromosome, Thread-like DNA structure , found in nuclei of cells, that carries .... disjuncture, Separation of chromosomes during meiosis. ... dominance value, Sum of dominance effects of all gene pairs influencing the trait of interest. ..... multiple alleles, More than two alleles existing in the population for a particular locus.

journal.frontiersin.org/article/10.3389/fpls.2013.00505/full

Nov 25, 2013 ... The typical behavior of chromosomes in meiosis is that homologous pairs synapse, recombine and then separate at anaphase I. At ... for managing the transmission of the first generation artificial chromosomes in plants. ... However, small chromosomes as observed in maize do not follow these rules. In this ...

www.learner.org/courses/essential/life/session3/closer2.html

Roll your mouse over the picture to see sex cells resulting from meiosis. ... In order for the offspring to resemble its parents, its first cell must receive the ... For humans, we know there are 46 chromosomes in body cells existing as 23 pairs. ... The two strands of each chromosome are then separated during the second cell ...

academic.oup.com/humrep/article-pdf/20/9/2463/6953767/dei079.pdf

pairing process during human fetal ovarian development ... first time the evolution of meiotic prophase to fetal development. ... show that homologous chromosomes pair very efficiently, but the high frequency of complete, premature homolo- gue separation found at diplotene suggests that mechanisms other than the pairing ...