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Apr 28, 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.
3 days 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.
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.
In prophase I of meiosis, chromosomes condense and homologous recombination takes place, leading to genetic variation through chromosomal crossover. This forms a tetrad, which is made up of four chromatids (two sister chromatids per chromosome).
- 12 min
- Sal Khan
- *Tetrad* or *bivalents* form when duplicated chromosomes, each composed of two identical chromatids, pair up and complete the process of crossing o...
- Great question! This is still being actively studied, but it does seem to depend (at least in part) on comparing the sequences of the chromosomes....
- Meiosis scrambles the genetic information from the individuals parents. So, a "maternal" chromosome means a chromosome that the individual producin...
- When the chromosomes duplicate during interphase the genetic material is doubled but it is still considered to have the same number of chromosomes...
- No. Crossover INCREASES genetic variation in gametes and offspring. Crossover allows the chromosomes you pass to your children to have some genes f...
- Every first meiotic division (when prophase I happen).
- The short chromosome can overlap too, it's just that he used an example of how crossing over can occur.
- The change in eye color would likely be explained by a change in epigenetics, how your cells read and express your genes. It is unlikely (though po...
- Exactly. That's why you and your siblings are so different. :) Why they are not inherited in pairs? Because it would create tetrads. If tetrads do...
Describe how crossing-over, independent assortment, and random fertilization lead to genetic variation. How many combinations of chromosomes are possible from sexual reproduction in humans? Create a diagram to show how crossing-over occurs and how it creates new gene combinations on each chromosome.
This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read this tutorial to know more details in each of these meiotic events and how they promote genetic diversity in sexually-reproducing organisms.
This process, in which homologous chromosomes trade parts, is called crossing over. It's helped along by a protein structure called the synaptonemal complex that holds the homologues together.
