chapter 24

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7 Terms

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gene

DNA sequences that encode specific proteins

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genetics

study of the inheritance of characteristics

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teratogen

chemicak or other environmental agent that causes a birth defect

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how many chromosomes are in a human zygote

46

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where does the chromoosomes in a human zygote come from

23 from sperm cell and 23 from egg

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what’s Down syndrome

having a extra chromosome, most common autosomal aneupiod condition

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what causes down syndrome

may arise from one copy of chromosome 21 exchanging parts w/ a different chromosome in a gamate and the fertilized ovum recieving excess chromosome 21 material