Round 10: Tossup 15

In plants, the number of these structures can be doubled by administering colchicine or oryxalin. (15[1])The adders’ tongue fern has up to 1,260 of these structures, the most of any plant. (15[1])Multiplying the number of these structures can lead to sympatric speciation, as seen in wheat, but can also lead to sterility, as seen in seedless watermelon. Sporophytes have (*) twice as many of these structures compared to gametophytes. Cells are classified as haploid when they have n of these structures or diploid when they have 2n of these structures. Humans typically have 46 of, for 10 points, what discrete units of DNA present during mitosis? ■END■

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