The parents struggle to understand what happened to their baby. “We don’t smoke, drink, or take drugs, so why did this happen?” the mother asks. Which of the following represents the most accurate...

The parents struggle to understand what happened to their baby. “We don’t smoke, drink, or take drugs, so why did this happen?” the mother asks. Which of the following represents the most accurate explanation?

a. Down syndrome is a genetically inherited disorder that is caused when both parents are carriers of a mutated gene.

b. Down syndrome is a genetically inherited disorder that may be caused when only one parent is a carrier of a mutated gene.

c. The risk for Down syndrome increases when the mother is older than age 35 and the egg is fertilized by multiple sperm.

d. The risk for Down syndrome increases when the mother is older than age 35 and chromosomes in her eggs fail to separate properly during cell division.