Tag Archives | Crossing-Over

Mechanism of Crossing Over | Cell Division

The following points highlight the four main hypothesis proposed for the mechanism of crossing over. The hypothesis are: 1. The Classical and Neo-Classical Hypotheses 2. Partial Chiasma Type Theory 3. Belling's Hypothesis 4. Copy-Choice Hypothesis. Mechanism of Crossing Over: Hypothesis # 1. The Classical and Neo-Classical Hypotheses: The classical hypothesis of crossing over was proposed by Sax in 1932; it [...]

By |2016-07-12T13:51:01+00:00July 12, 2016|Cell Division|Comments Off on Mechanism of Crossing Over | Cell Division

Mitotic Crossing Over | Cell Division

The below mentioned article provides a short note on mitotic crossing over. Crossing over not only occurs during meiosis but also during mitosis. In individuals heterozygous for a gene producing a visible phenotype, somatic crossing over leads to the production of "twin spots" of dominant and recessive phenotypes. Mitotic crossing over was first discovered in Drosophila by Stern in 1936, [...]

By |2016-07-12T13:51:01+00:00July 12, 2016|Cell Division|Comments Off on Mitotic Crossing Over | Cell Division

Molecular Basis of Crossing Over | Cell Division

In this article we will discuss about the molecular basis of crossing over. Any molecular model of crossing over must accommodate the explanation of the following phenomena: (a) Gene conversion, (b) Post-meiotic segregation, (c) Polarized conversion and (d) Negative interference. a. Gene Conversion: It is the unequal recovery of alleles in the region of exchange during genetic recombination in cases [...]

By |2016-07-12T13:51:01+00:00July 12, 2016|Cell Division|Comments Off on Molecular Basis of Crossing Over | Cell Division
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