Which of these can result in a trisomy such as Down syndrome?

Question

Quizplus · Accepted Answer

Trisomy occurs when a zygote has three copies of a particular chromosome instead of the usual two copies. Down syndrome is caused by an extra copy of chromosome 21, which is why it is also known as Trisomy 21. Choice C is the only option where the zygote would end up with three copies of chromosome 21 (24 + 23 = 47 chromosomes in total), making it the only viable option for a trisomy such as Down syndrome.

Which of These Can Result in a Trisomy Such as Down