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1. Define homozygous and heterozygous.
5. Under what conditions does a female acquire an X-linked recessive disorder?
10. Describe briefly amniocentesis and its purpose.
21-5 Differentiate a chromosomal disorder from a single-gene disorder. (Autosomal recessive,
autosomal dominant, and x-linked dominant and x-linked recessive disorders.)
21-6
a. At which stage of pregnancy does the highest risk or central nervous system damage occur?
b. State 5 substances that are thought to be teratogenic.
21-8 Explain the meaning of trisomy 21.

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