Round 10: Tossup 15

In plants, the number of these structures can be doubled by administering colchicine or oryxalin. 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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