Division — 3 Chemistry PYQs with Answers | UKPSC PYQ Hub

Question 1

The number of chromosome pairs found in cells of the human body is–

Accepted Answer

23. Humans have 23 pairs of chromosomes, for a total of 46 chromosomes in which 22 pairs of chromosomes are same in male and female and homologus to each other in pair. They are collectively known as autosomes. The 23rd pair, the sex chromosomes, differ between males and females. These chromosomes are known as heterosomes.

Question 2

In which stage of meiotic cell division are chiasmata formed?

Accepted Answer

Prophase. Chiasmata are formed during prophase of meiosis-I. This is the stage where homologous chromosomes pair up and exchange genetic material through crossing over, which is essential for genetic diversity.

Question 3

Which of the following cells have the most regenerative capacity?

Accepted Answer

Committed stem cells. Committed stem cell have a higher regenerative capacity compared to other cell types listed because they retain the ability to differentiate into specific cell types and proliferate to replace damaged or dead cells.