| 11. | Many species have so-called sex chromosomes that determine the gender of each organism.
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| 12. | Griffiths and Thwari knew that birds contain different sex chromosomes just as humans do.
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| 13. | There may, or may not, be sex chromosomes . haploid cells have single copies.
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| 14. | Genes that are carried by either sex chromosome are said to be sex linked.
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| 15. | Each person has two copies of all chromosomes, except the sex chromosomes in males.
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| 16. | Many insects use a sex determination system based on the number of sex chromosomes.
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| 17. | The SLC6A8 gene is located on the short arm of the sex chromosome, Xq28.
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| 18. | About 1 in 3000 people are missing a sex chromosome; many go to college.
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| 19. | The 23rd pair of chromosomes are the sex chromosomes.
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| 20. | Multifactorial systems involve rearrangements of sex chromosomes and autosomes.
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