Biology Holiday Homework Crossword

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Across
  1. 2. Different forms of the same gene, usually dominant or recessive
  2. 4. Controlled cell death
  3. 8. A usually single-celled organism without a distinct nucleus or membrane-bound organelles
  4. 9. small cylindrical organelles that help the cell to divide and replicate themselves
  5. 10. The number and visual appearance of the chromosomes in the cell of an organism
  6. 13. The final phase of cell division where the chromatids or chromosomes move to opposite ends of the cell and two nuclei are formed
  7. 15. The stage in the development of a cell following mitosis or meiosis, during which the nucleus is not dividing
  8. 17. Haploid cells that unite with a similar type of cell to reproduce
  9. 19. The smallest structural and functional unit of an organism, which consists of cytoplasm and typically a nucleus enclosed in a membrane
  10. 21. The first stage of cell division where chromatids are paired up and the nuclear envelope disappears
  11. 23. A structure that forms a spindle in mitosis or meiosis that is responsible for moving chromosomes during nuclear division
  12. 24. An organism consisting of a cell or cells bound by a membrane and with a distinct nucleus
  13. 26. structural layer surrounding some types of cells, situated outside the cell membrane providing support and protection
  14. 27. A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus
Down
  1. 1. A type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell
  2. 3. Organelles that produce proteins needed to repair, damage or direct chemical processes
  3. 5. Specialised structures within a cell that carry out specific functions
  4. 6. The chain of nucleotides that contain genetic information, commonly abbreviated as DNA
  5. 7. The complete set of genetic material present in a cell or organism
  6. 8. Chemical structures required for the structure, function, and regulation of the body's tissues and organs
  7. 9. The constriction point of a chromosome, which divides the it into two sections
  8. 11. Cells in multicellular organisms that directly produce gametes
  9. 12. The second stage of cell division during which the chromosomes become attached to the spindle fibres.
  10. 14. Any cell of a living organism other than the reproductive cells
  11. 16. Cells that contain two complete sets of chromosomes and reproduce by mitosis making daughter cells that are exact replicas
  12. 18. A region of DNA that codes for a specific protein or trait
  13. 20. A long coiled strand of DNA found in the nucleolus
  14. 22. a membrane-bound structure that controls the most important functions of the cell, such as the growth and reproduction of the cell
  15. 25. Cells that contain contain only one complete set of chromosome cells are a result of the process of meiosis