Question

Which of the following statements is true about a chromosome that has been subjected to the G bending technique?

a.It has the short are stained, but not the long arm
b.It has the cetromere and telomere stained, but not other parts
c.It shows alternating patterns of dark and light regions
d.it has the long arm stained, but not the short arm

Answer 1

A chromosome that has been subjected to the G banding technique shows alternating patterns of dark and light regions due to the binding of Giemsa stain to tightly coiled DNA and condensed proteins.

Step-by-step explanation:

When a chromosome is subjected to the G banding technique, it exhibits alternating patterns of dark and light regions. This is due to the staining with Giemsa dye, which preferentially binds to areas of tightly coiled DNA and condensed proteins, known as heterochromatin. These appear as dark bands. The light bands represent euchromatin, which is less condensed and typically houses actively transcribed genes. Every chromosome has a unique banding pattern that can be used for identifying chromosomal abnormalities.