Question
Question: An abnormal male child is born to normal parents. This child shows a short neck, stubby hands, slant...
An abnormal male child is born to normal parents. This child shows a short neck, stubby hands, slanting eyes, permanently open mouth with projecting upper lip and short stature. This abnormality can be attributed to
A
An extra Y chromosome
B
An extra X chromosome
C
An extra chromosome in the 21st pair of autosomes
D
Absence of X chromosome leading to a total of 45 chromosomes instead of the normal 46
Answer
An extra chromosome in the 21st pair of autosomes