Fill in the following blanks with suitable words :
X and Y chromosomes are called………………….chromosomes.

Explanation

To fill in the blanks in the statement "X and Y chromosomes are called………………….chromosomes," we need to identify the correct term that describes X and Y chromosomes.

### Step-by-Step Solution:

1. **Identify the Chromosomes**: Recognize that X and Y chromosomes are specific types of chromosomes found in humans and many other organisms.

2. **Understand Their Function**: X and Y chromosomes are responsible for determining the sex of an individual. Males typically have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

...