Crossing over is the swapping of genetic material that occurs in the germ line.
Crossing over
Crossing Over - Variation of Traits in Humans
Difference Between Linkage And Crossing Over
Mechanical model of crossing-over (Morgan et al. 1915, p. 60)
Crossing Over - Definition and Functions
Does crossing-over ever occur within a gene? - The Tech Interactive
10.1.2 Crossing Over, DP IB Biology: HL Revision Notes 2016
10.2 Dihybrid Crosses and Gene Linkage
GENETICS / RECOMBINATION (CROSSING OVER) - Pathwayz
Chromosomal crossover - Wikipedia
VCAC: Cellular Processes: Meiosis: First Look
LearnSci LabSim: Crossing Over and Recombination
Crossing Over Lab Genetics Activity
Animation 11.3 Crossing over
Unequal crossing over - Wikipedia