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In genetics, the coefficient of coincidence (c.o.c.) is a measure of interference in the formation of chromosomal crossovers during meiosis. It is generally the case that, if there is a crossover at one spot on a chromosome, this decreases the likelihood of a crossover in a nearby spot. [1] This is called interference.
Crossover interference is the term used to refer to the non-random placement of crossovers with respect to each other during meiosis.The term is attributed to Hermann Joseph Muller, who observed that one crossover "interferes with the coincident occurrence of another crossing over in the same pair of chromosomes, and I have accordingly termed this phenomenon ‘interference’."
The Kosambi mapping function was introduced to account for the impact played by crossover interference on recombination frequency. It introduces a parameter C, representing the coefficient of coincidence, and sets it equal to 2r. For loci which are strongly linked, interference is strong; otherwise, interference decreases towards zero. [5]
In genetics, a chiasma (pl.: chiasmata) is the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomes. At a given chiasma, an exchange of genetic material can occur between both chromatids, what is called a chromosomal crossover, but this is much more frequent during meiosis than mitosis. [1]
In population genetics, the Hill–Robertson effect, or Hill–Robertson interference, is a phenomenon first identified by Bill Hill and Alan Robertson in 1966. [1] It provides an explanation as to why there may be an evolutionary advantage to genetic recombination .
Luck. Fate. Blessing. A glitch in the matrix. Or, if you’re more skeptical, just a coincidence.. It’s a phenomenon that, from a statistical perspective, is random and meaningless.
Frank, S.A. (1995). George Price's contributions to Evolutionary Genetics. Journal of Theoretical Biology 175: 373-388 abstract - full text, pdf 412 KB (both from Steven A. Frank's Home Page) Frank, S.A. (1997). The Price Equation, Fisher's fundamental theorem, kin selection, and causal analysis. Evolution 51:1712–1729 full text, pdf 551 KB
WASHINGTON − The House Ethics Committee on Monday released a damaging report alleging there is "substantial evidence" former Rep. Matt Gaetz, R-Fla., participated in "prostitution, statutory ...