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A selective sweep can occur when a rare or previously non-existing allele that increases the fitness of the carrier (relative to other members of the population) increases rapidly in frequency due to natural selection. As the prevalence of such a beneficial allele increases, genetic variants that happen to be present on the genomic background ...
A multiple origin soft sweep happens when mutations are common, for example in a large population, so that the same or similar beneficial mutations occur on a different genomic background such that no single genomic background can hitchhike the high frequency. [2] Whether the selective sweep has occurred can be explored in various ways.
Balancing selection refers to a number of selective processes by which multiple alleles (different versions of a gene) are actively maintained in the gene pool of a population at frequencies larger than expected from genetic drift alone.
Diagram of an off-tackle play. An off-tackle run in American football is a play in which the running back carries the ball through a running lane off of the tackle's block. The lead block kicks out the end man on the line of scrimmage, and another offensive player usually blocks the linebacker.
The cross between Labeotropheus fuelleborni (subterminal mouth for biting algae off rocks) and Metriaclima zebra (terminal mouth for suction feeding) allowed for mapping of QTLs affecting feeding morphology. Using the QTL sign test, definitive evidence was used to support the existence of directional selection in the oral jaw apparatus in ...
Agonistic behaviour is a result of evolution, [5] and this can be studied in a number of species facing different environmental pressures. Though agonistic behaviours can be directly observed and studied in a laboratory setting, it is also important to understand these behaviours in a natural setting to fully comprehend how they have evolved and therefore differ under different selective ...
Toss sweep Buck sweep Flanker sweep Quarterback sweep. A sweep is an outside running play in American football where a running back takes a pitch or handoff from the quarterback and starts running parallel to the line of scrimmage, allowing for the offensive linemen and fullback to get in front of him to block defenders before he turns upfield.
In the off-tackle run, the quarterback would hand off (often to the fullback) who started running to the position between the tight end and tackle, but would aim for the best hole that developed. In the sweep, the two guards would pull to form the outside wall of the running lane, while the center and run side tackle would form the inside wall ...