Which of the following could explain how some (although not many) people can have Down syndrome and have a normal chromosome number?
A) One of the cells during development had trisomy 21 but then died.
B) An unbalanced translocation carrying most of chromosome number 21 occurred.
C) A large enough fragment of one copy of chromosome number 21 underwent a deletion.
D) Some of the genes in one copy of chromosome number 21 were mutated.
E) None of the answer options is correct.
Correct Answer:
Verified
Q162: The occurrence of nondisjunction during mitosis can
Q163: A couple has a baby that is
Q164: In a person with the genotype XXY,
Q165: There are no discernible phenotypic effects for
Q166: First division nondisjunction will only yield gametes
Q167: Which of the following statements is TRUE
Q168: Trisomy 21 (Down syndrome) is the only
Q170: In mammals, females have two copies of
Q171: A karyotype is a technique by which
Q172: What is one reason a woman with
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents