Question

Occurrence of an extra chromosome in a diploid set of chromosomes is called ___________.

• A. monosomy
• B. polysome
• C. trisomy
• D. polyploidy

Hint:

{2n + 1 = Trisomy}

Answer 1

The Correct Option is C

Step 1: Understanding chromosome number variations.
A diploid organism normally has two copies of each chromosome (2n).
Step 2: Extra chromosome condition.
When one extra chromosome is added to the diploid set, the condition becomes (2n + 1).
Step 3: Terminology.
This condition is known as trisomy. A common example is Down syndrome (Trisomy 21).