Triplo-X syndrome is when a woman has an extra X chromosome. Using your knowledge of chromosomal inheritance, which of the following statements is most likely to be correct?
a) A woman with three X chromosomes produces oocytes with two X chromosomes, which could result in her giving birth to a XXY son.
b) This condition does not exist because a fetus with three X chromosomes cannot survive birth.
c) Women with this condition are usually marked by profound mental impairment.
d) Women with this disease are able to give birth to normal children with the normal number of sex chromosomes.
e) Both a) and d) are likely to be correct.
Answer: Both a) and d) are likely to be correct.