what are the causes of chromosomal abnormalities?

what are the causes of chromosomal abnormalities

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Genes n yta Yan sis.. namamana n defect. Specially if present sa both n bloodline ng parents malaki chance n mag manifest sa magging anak.kya nga bawal Ang mag kapatid n maging mag asawa bukod sa taboo.. prone din ung mgging anak nila n magkaroon ng defect.