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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 ...

en.wikipedia.org/wiki/Chromosome_segregation

Chromosome segregation is the process in eukaryotes by which two sister chromatids formed as a consequence of DNA replication, or paired homologous chromosomes, separate from each other and migrate to opposite poles of the nucleus. This segregation process occurs during both mitosis and meiosis. ... These chromosomes (paired chromatids) then pair with the homologous ...

leavingbio.net/cell%20division.htm

CHROMOSOMES HAPLOID AND DIPLOID CELLS CELL CONTINUITY ... of the cell cycle: interphase, division of the nucleus (mitosis or meiosis) and cytokinesis. ... The newly formed chromosomes (which were recently chromatids while they ... The homologous pairs of chromosomes then separate and move to the poles of ...

www.tusculum.edu/faculty/home/ivanlare/html/genetics/meiosis-master.html

Homologous chromosomes separate during meiosis so that each daughter cell has only 23 chromosomes, one from each homologous pair of chromosomes.

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 ...

phys.org/news/2012-04-sperm-eggs-precisely-chromosomes.html

Apr 12, 2012 ... During meiosis, the cell division process that creates sperm and eggs, matching chromosomes pair up and become connected by "crossing ... Then they discovered the missing tool for crossing-over: three yeast enzymes, ... rings, two interlocked pieces of DNA are separated after DNA is copied or repaired.

academic.emporia.edu/mooredwi/genetics/prob3.htm

Aug 23, 1996 ... These two chromatids are then called sister chromatids. ... During PROPHASE of mitosis the chromosomes are coiling but they ... You know that it must be anaphase of the first meiotic division because the homologous chromosomes are ... number of chromosomes with each chromosome existing as a pair ...

sciencewithmrsb.weebly.com/genetic-variation-and-change.html

Somatic mutations occur in any cells of the body other than in the gametes so are ... Many may be silent – not observed – and may only be selected for or against ... of Gametes & the mixing up of existing alleles into new combinations = Meiosis ... During meiosis I (first division), Metaphase 1- chromosomes pairs line up up ...

www.mhhe.com/biosci/genbio/raven6b/graphics/raven06b/other/raven06b_12.pdf

12.3 The sequence of events during meiosis involves two nuclear ... Prophase I. Homologous chromosomes pair intimately, ... the cells and then fracturing them. ... of chromosomes found in other cells, fuse to produce a sin- .... separate from each other in the first nuclear division, so ..... serve existing combinations of genes.

courses.lumenlearning.com/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, ... If homologous chromosomes fail to separate during meiosis I, the result is two ... An individual with more than the correct number of chromosome sets (two for ...