Bio exam 4

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Author:
kcarson
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225299
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Bio exam 4
Updated:
2013-07-01 00:14:26
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bio
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bio exam 4
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  1. Humans and many other eukaryotes have two "kinds" on chromosomes: ____ (normal, everyday chromosomes) and ___ ( those involved with determining sex)
    autosomal; sex chromosomes
  2. In humans, it is the __ (or genes on the __, specifically the SRY gene)that determines the sex.
    Y
  3. The __ has nothing to do with sex, but instead has normal, everyday genes
    X
  4. Genes located on the sex chromosomes are inherited in a ___ fashion.
    criss-cross
  5. __-linked genes are never expressed in females.
    Y
  6. __-linked recessive traits tend to be expressed more often in males than females.
    X
  7. Males are said to be ____ for X-linked genes.
    hemizygous
  8. _________ is in female mammals, and is when one X chromosome in each cell is inactivated (called dosage compensation). This ______ accounts for some differences between different tissues in some female mammals (i.e. calico coat color in cats). Allows for both male and female cells to be the same with respect to X-linked genes.
    X-chromosomes Inactivation; X inactivation
  9. Human disorders caused by change in ______ _____.
    chromosome number
  10. _______ = failure of chromosomes (or chromatids) to disjoin during meiosis. 1/2 of the gametes will have an extra chromosome, and 1/2 of the gametes will be missing a chromosome. Results in aneuploidy.
    Nondisjunction
  11. ____ ____: Sex chromosome nondisjunction
    Human aneuploidy
  12. ______ _____ = XXY (1:2,000)
    Klinefelter syndrome
  13. ____-__ = XXX (1:1,000)
    Triplo-X
  14. ___ ____= XO (1:5,000)
    Turner syndrome
  15. XYY = ???
    Doesn't live long enough to be born, aborts itself
  16. Autosomal nondisjunction
  17. These individuals will tend to pass these advantages onto their offspring 
    members of the pop. that differ from one another

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