Question

At which of the following stages, the chromosomes appear single, thin and thread like?

• A. Leptotene
• B. Zygotene
• C. Pachytene
• D. Diplotene

Answer 1

The correct option is A Leptotene

Leptotene also known as leptonema is the first stage of prophase I during which individual chromosomes begin to condense into long strands within the nucleus which are loosely interwoven. However, the two sister chromatids are still so tightly bound that they are indistinguishable from one another. They possess a string of. swollen areas called chromomeres.

So, the correct answer is option A.