Only nine types of aneuploids are known in newborns because
A)only nine chromosomes undergo nondisjunction.
B)most types of aneuploids are lethal early in development.
C)most aneuploids do not cause detectable defects.
D)most aneuploids do not affect the phenotype.

Question

Quizplus · Accepted Answer

Most types of aneuploids are lethal early in development, which limits the number of potential combinations of extra or missing chromosomes that can survive to birth. As a result, only nine types of aneuploids are known in newborns, including conditions such as Down syndrome (trisomy of chromosome 21) and Turner syndrome (monosomy of the X chromosome).

Only Nine Types of Aneuploids Are Known in Newborns Because