Question

Name one commonly occurring genetic disorder in humans which is caused due to monosomy (one chromosome less than the normal number of chromosomes) of sex chromosome. Give its two symptoms.

Hint:

Turner’s syndrome occurs in females due to absence of one X chromosome — look for features like short stature, infertility, and webbed neck.

Answer 1

Step 1: The genetic disorder caused by monosomy of a sex chromosome is called Turner’s syndrome. It occurs due to the presence of only one X chromosome (45, $X_{O}$).
Step 2: Two symptoms of Turner’s syndrome are:

• Underdeveloped secondary sexual characters.
• Short stature and webbed neck.