Which statement describes the relationship between parental age and the incidence of chromosomal disorders?
a) Men who father children in middle age run a negligible risk of producing children with chromosomal disorders.
b) The risk of chromosomal disorders rises steeply for women wishing to become pregnant in their 40's.
c) Parental age poses very little risk to the development of chromosomal disorders.
d) Chromosomal disorders are only a risk for older parents if either parent has a family history of chromosomal disorders.
Answer: b
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