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Hace 1 día · Crossing over is a cellular process that happens during meiosis when chromosomes of the same type are lined up. When two chromosomes — one from the mother and one from the father — line up, parts of the chromosome can be switched.
Hace 4 días · This animation shows crossing over, which is the process by which homologous chromosomes exchange portions of their chromatids during meiosis. As you can see, crossing over results in new combinations of genetic information, thus affecting inheritance and increasing genetic diversity.
Hace 2 días · In meiosis, the chromosomes duplicate (during interphase) and homologous chromosomes exchange genetic information (chromosomal crossover) during the first division, called meiosis I. The daughter cells divide again in meiosis II , splitting up sister chromatids to form haploid gametes .
Hace 1 día · Genetic recombination. A model of meiotic recombination, initiated by a double-strand break or gap, followed by pairing with an homologous chromosome and strand invasion to initiate the recombinational repair process. Repair of the gap can lead to crossover (CO) or non-crossover (NCO) of the flanking regions.
Hace 3 días · If a cell has extra chromosomes or is missing a chromosome, that can have very substantial impacts on how it functions. We can think of meiosis as a way cells very carefully count and divide their chromosomes so that each gamete, each egg or sperm, has exactly 23 chromosomes.
Hace 5 días · Nondisjunction is the failure of two chromosomes to separate during gamete formation, resulting in gametes with either a missing chromosome (monosomy) or an extra one (trisomy). As this animation illustrates, nondisjunction can occur either if the homologs fail to separate in meiosis I, or if the sister chromatids fail to separate in ...
Hace 3 días · It is usually followed by reunion (frequently at a foreign site, resulting in a chromosome unlike the original). Breakage and reunion of homologous chromosomes during meiosis are the basis for the classical model of crossing over, which results in unexpected types of offspring of a mating.
