Crossover

A double crossover that involves only two of the four chromatids of a tetrad.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Full article >>>

Chromosomal crossover
(Redirected from Crossing over)
Chromosomal crossover is the process by which two chromosomes, paired up during Prophase I of meiosis, exchange some distal portion of their DNA.
Full article >>>

Crossover occurs when two chromosomes, normally two homologous instances of the same chromosome, break and then reconnect but to the different end piece.
Full article >>>

no crossover has occurred. Both copies of the mutant allele have been sequestered in the polar body so the egg may safely be fertilized.
For simplicity, the figure shows only the pair of homologues carrying the locus of concern.
Full article >>>

However, crossover is the key element that distinguishes genetic algorithms from other methods such as hill-climbers and simulated annealing.
Full article >>>

Interference One crossover event inhibits the chances of another crossover event. Also known as positive interference. Negative interference increases the chance of a second crossover.
See also: crossing over ...
Full article >>>

Crossovers -- the exchange of genetic material between two paired chromosome during meiosis.
Full article >>>

Positive interference: the interaction between crossovers such that the occurrence of one exchange between homologous chromosomes reduces the likelihood of another in its vicinity.
Full article >>>

genetic maps Diagrams showing the order of and distance between genes; constructed using crossover information.
genetics The study of the structure and function of genes and the transmission of genes from parents to offspring.
Full article >>>

Unequal cross-over
A recombination event that occurs between DNA molecules that are not fully aligned. For example, a crossover may occur between repeated DNA sequences resulting in the deletion or duplication the intervening DNA sequence.
Full article >>>

: Lethal mutations in different genes on the same pair of chromosomes that remain in repulsion because of close linkage or crossover suppression.
In a closed population, only the trans-heterozygotes (l1 + / + l2) for the lethal mutations survive.
Full article >>>

Holliday intermediate An intermediate in genetic recombination in which two double-stranded DNA molecules are joined by virtue of a reciprocal crossover involving one strand of each molecule.
Full article >>>


'"/>