double crossover


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double crossover

two separate CROSSING-OVER events occurring between CHROMATIDS. In a TEST CROSS involving three genes, progeny that have carried out this process can be identified and usually from the least frequent type of offspring.
References in periodicals archive ?
A double crossover between the MONSTER-phr and the chromosome at the 5' and Tg regions results in the pyrE-lacS marker and 3' region insertion at the phr locus.
A double crossover between the MONSTER-argD and the chromosome at the Tg and 3' regions results in the pyrE-lacS marker and 5' region insertion at the argD locus.
The driving simulator played an important role in testing human factors issues related to double crossover diamonds when FHWA introduced that interchange design in the United States in 2004 in Springfield, MO.
In comparison to a conventional diamond interchange, a double crossover diamond design involves having drivers.
Students should map each interval separately, use these data to assemble two chromosome maps, and revise their maps to account for the double crossover class (if observed).
Service Volumes of Conventional and DCD Interchange Designs Northbound Off-Ramp Southbound Off-Ramp (veh/h/ln) (veh/h/ln) Service Volumes L L Conventional Diamond 390 390 Double Crossover (four lanes) 600 600 Double Crossover (six lanes) 700 700 Eastbound Westbound (veh/h/ln) (veh/h/ln) Service Volumes L T L T Conventional Diamond 330 600 330 600 Double Crossover (four lanes) 600(L/T) * 600 600(L/T) * 600 Double Crossover (six lanes) 600(L/T) * 600 600(L/T) * 600 * (L/T) means that the left-turning traffic, as well as through traffic, uses the lane.
"For years, the Federal Highway Administration has encouraged innovative and cost-effective intersection designs, and the double crossover diamond interchange is an excellent example."
This TechBrief summarizes information on one of the alternative interchange designs, the double crossover diamond (DCD) interchange.
The DLT interchange design has similarities to both the at-grade DLT intersection and the double crossover diamond interchange.
In the absence of double crossovers, the E1_ tt class would also be e7e7.
According to London Trackwork, the order contains No 6, 8 and 12 geometry turnouts with single and double crossovers.