Question

The appearance of recombination nodules on homologous chromosomes during meiosis characterizes:

• A. Personalization
• B. Synaptonemal complex
• C. Bivalent
• D. Sites at which crossing over occurs

Answer 1

Answer:

D. Sites at which crossing over occurs

• Crossing over, or genetic recombination occurs at specific locations along the homologous chromosomes, known as recombination nodules or chiasmata.

• This phenomenon is an essential part of meiosis, leading to the shuffling and exchanging of genetic information.

• The synaptonemal complex helps to facilitate this transfer of material, though it is not necessarily related to the appearance of recombination nodules.

• Bivalents consist of two homologous chromosomes and four chromatids; the presence of recombination nodules is a characteristic feature.

• Terminalization refers to the orientation of these nodules towards the ends of chromosomes in later stages but does not have any connection with their emergence.