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Apr 27, 2017 · Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes during meiosis, which results in new allelic combinations in the daughter cells. Learn how crossing over occurs, what are its functions, and how it affects linkage maps and inheritance patterns.
Chromosomal crossover, or crossing over, is the exchange of genetic material during sexual reproduction between two homologous chromosomes' non-sister chromatids that results in recombinant chromosomes.
Feb 26, 2009 · Crossing Over: Directed by Wayne Kramer. With Harrison Ford, Ray Liotta, Ashley Judd, Jim Sturgess. Crossing Over is about illegal aliens of many nationalities in the Los Angeles area and the authorities and individuals dealing with them.
- (25K)
- Crime, Drama
- Wayne Kramer
- 2009-02-26
1 day ago · 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.
Crossing over. The points where homologues cross over and exchange genetic material are chosen more or less at random, and they will be different in each cell that goes through meiosis. If meiosis happens many times, as in humans, crossovers will happen at many different points.
- Good question! I think that is assumed to be generally true, but it would be very hard to test in most organisms. The only evidence for this being...
- there was no chromosomal duplication in meiosis II only the centrosome duplicated. If there would have been chromosomal duplication cells would nev...
- Well, it works based on patterns of nuclear defragmentation. On the places where old fragments of a nucleus are, new form. Also, thanks to cytokine...
- The number of chromosomes becomes haploid in meiosis I, because the actual sister chromatids are not pulled apart by spindle fibers. For example, i...
- Remember that when replicating in interphase, the chromosome number DOES NOT CHANGE in interphase before S (replication phase) we have 46 single st...
- Interphase _is_ stage of the cell cycle, but _not_ a stage of _cell division_ (meisosis). Interphase is that gap phase (exactly G0) where cell cycl...
- Yes, meiosis's goal is to make a zygote. This zygote will (hopefully) turn into an embryo, then a fetus, which eventually becomes a human if everyt...
- You're almost correct. Males transfer sperm to the female and only one of the many sperm ends up fertilizing the egg. Then the fertilized egg becom...
- Correct. Meisosi II is reduction division. Why? Because, final products of meiosis, *gametes* are _haploid cells_. Just remember that ova and sperm...
- 1. Chromosomes condense and homologs loosely pair along their lengths, aligned by gene. 2. The paired homologs become physically connected along th...
Learn how chromosomal crossover increases genetic variation in gametes and offspring during prophase I of meiosis. Watch a video and read comments from other learners and experts.
- 12 min
- Sal Khan
Crossing over is the exchange of genetic material between homologous chromosomes during meiosis I. It increases genetic diversity and helps in genetic mapping and inheritance.