A 42-Year-Old Woman Becomes Pregnant

question 18

Essay

A 42-year-old woman becomes pregnant.Her physician recommends amniocentesis (a test for fetal chromosomal disorders).When the results are analyzed by the laboratory,it is determined that the fetus has 47 chromosomes.Name and fully explain what caused this disorder.When the woman and her husband consult a genetic counselor,they are told that this problem is likely to have occurred in the woman's egg cells as opposed to her 50-year-old husband's sperm cells.Explain why.

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