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Across 3. a cell or nucleus containing two complete sets of chromosomes, one from each parent 7. a cell cell having only half the usual number of chromosomes 9. newly formed cells when a cell undergoes cell division 11. a point at which paired chromosomes remain in contact prior to crossing over 12. complex of proteins associated with the centromere of a chromosome during cell division, to which the microtubules of the spindle fibers attach. 13. one of two identical halves of a replicated chromosome 14. two identical copies of the same chromosome formed by DNA replication, attached to each other by a structure called the centromere 15. Centromere a constricted region of a chromosome that separates it into a short arm (p) and a long arm (q)

Down 1. made up of chromosome pairs of approximately the same length, centromere position and genes 2. exchange of genetic material between non-sister chromatids of homologous chromosomes during meiosis, which results in new allelic combinations in the daughter cells 4. division of cytoplasm 5. pair of small sets of microtubules that moves to the opposite poles during cell division 6. protein structures that pull apart the chromosomes in a cell when the cell divides 8. fusion of chromosome pairs at the start of meiosis 10. pairs of homologous chromosomes