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9 explain the differences between monozygotic

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9. Explain the differences between monozygotic, dizygotic, and conjoined twins. 10. Name the process that forms the haploid gametes. 11. Why is it important for gametes to have half the number of chromosomes that somatic cells contain?
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Name: ________________________________________________ Period: ____ Date: ___________ 12. How does meiosis reduce the number of chromosomes in half? 13. What is non-disjunction? Draw an example of non-disjunction. 14. How does someone get Turner syndrome? 15. Describe two ways we can test for chromosomal abnormalities before a baby is born. 16. Name two ways meiosis increases genetic variation in the gametes. 17. How does assortment of chromosomes lead to genetic variation? Draw an example.
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Name: ________________________________________________ Period: ____ Date: ___________ 18. How many possible chromosome combinations are there if a cell that is undergoing meiosis starts with 8 chromosomes? 19. What is crossing over and when does it occur? 20. Show through a drawing how crossing over increases genetic variation in the gametes. 21. What are the differences between mitosis and meiosis?
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