In Morgan's linkage experiment, when males and females of the F2 generation mate with each other and produce offspring, the percentage of recombinants was:

Explanation

Morgan and his students have found that linked genes show varied recom­binations, some being more tightly linked than others. (i) In Drosophila, a crossing of yellow-bodied (Y) and white-eyed (W) females with brown-bodied (Y+) red-eyed (W+) males produced F1 to be brown-bodied red-eyed. On intercrossing of F1 progeny, Morgan observed that the two genes did not segregate independently of each other and, therefore, the F2 ratio deviated significantly from the expected 9: 3: 3: 1 ratio. He found 98.7% to be parental and only 1.3% recombinants. (ii) In a second cross in Drosophila between white-eyed and miniature-winged (mm) females with wild type or red-eyed normal winged (w+w+m+m+) males, all the F1 were found to be of wild type, i.e., red-eyed and normal winged. An F1 female fly was then test crossed with white-eyed and miniature winged male. 62.8% of the progeny was of parental types while 37.2% were recombinants.