Stern wished to investigate whethercrossing over involved breaking of chromosome

Question

Stern wished to investigate whethercrossing over involved breaking of chromosomes and rejoining ofchromosomes. He used females in the cross which had X-linked mutantalleles that affected their visible phenotype and X chromosomeswhich looked different from the normal X. Why did he use bothvisible and chromosomal traits in the cross? a. The visibletraits were used to monitor recombination between genes as is usualin mapping crosses. b. The chromosomalstructure differences were used so that if chromosomes broke andexchanged pieces during recombination, the recombinant chromosomeswould be physically different and could be recognized by looking atthem through the microscope. c. The visibletraits were not necessary. d. The chromsomestructural differences were not necessary. e. a and b aretrue.

Explanation / Answer

e. a and b are true.

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