msf << bk1 << tk << bk2 << mi
homozygous viable homozygous fertile Crossing over in 2R strongly reduced. Carries cn2 in most laboratory stocks. Interchromosomal effect on crossing over and primary nondisjunction greater when in cis with In(2L)Cy than in trans (Valentin, 1972).
L. Ward, June 1921.
Used as a balancer in combination with In(2L)Cy.
Quasi cosmopolitan inversion.
In(2L)Cy and In(2R)Cy in heterozygous condition significantly increase the crossing over frequency in the proximal and distal regions of the X chromosome while in the middle of the chromosome crossing over frequency remains unaltered. The effect on interference remains unaltered at both ends of the X chromosome while a significant decrease is observed in the middle of the chromosome. Results suggest that the interchromosomal effect on crossing over affects the preconditions of exchange differently in different regions of the X chromosome and possibly the duration of chromosome pairing.
Used in combination with In(2L)Cy as a balancer for chromosome 2.