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1. the map of a chromosome interval is A 10 B 40 C. from the cross Abc/aBC *abc/abc, how many double crossovers would be expect out of 1000 progeny?
2. the R/r and S/s gens are linked and 10 map units apart. In the cross Rs/rS * rs/rs what fraction of the progeny will be RS/rs?

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