Class 12 NEET Biology Principles of Inheritance and Variation Questions Part 1

In human beings, 45 chromosomes with single X∕XO abnormality causes Turner's syndrome. Individuals having a single X chromosome 2A+XO (45) have female sexual differentiation but ovaries are rudimentary. Other associated phenotypes of this condition are short stature, webbed neck, broad chest, lack of secondary sexual characteristics and sterility. Thus, any unbalance in the copies of the sex chromosomes may disrupt the genetic information necessary for normal sexual development.