Question

How does deletion occur?

(a) When a part of a chromosome is duplicated

(b) When a part of a chromosome is left out

(c) When a part of a chromosome is lost

(d) When a part of a chromosome is translocated

I have been asked this question during an internship interview.

My doubt stems from Inheritance and Variation Principles topic in portion Principles of Inheritance and Variation of Biology – Class 12

Answer 1

The correct choice is (c) When a part of a chromosome is lost

The best I can explain: Deletions are a type of chromosomal aberrations where a part of a chromosome is lost. It is of two types-terminal and intercalary deletions. When the terminal segment of the chromosome is lost then it is known as terminal deletions and when an intercalary segment is lost then it is known as intercalary deletions.