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gene
DNA sequences that encode specific proteins
genetics
study of the inheritance of characteristics
teratogen
chemicak or other environmental agent that causes a birth defect
how many chromosomes are in a human zygote
46
where does the chromoosomes in a human zygote come from
23 from sperm cell and 23 from egg
what’s Down syndrome
having a extra chromosome, most common autosomal aneupiod condition
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