Question

In the following statements identify the false statement:-

• A. Pairing of maternal and paternal chromosome during zygotene is called synapse
• B. Terminalization occurs completely during diplotene
• C. Chiasmata are the site of crossing over of genetic material
• D. Prophase -I is the most complicated and longest stage of meiosis (dividing phase)

Answer 1

The correct option is B Terminalization occurs completely during diplotene

Correct answer is (C) Terminalization occurs completely during diplotene - is false.
The beginning of diplotene is recognised by dissolve of synaptonemal complex (desynapsis). Due to desynapsis chiasmata begin to move along with length of chromosome and towards the end of chromosome. This event is called terminalization. However, Terminalisation completes in diakinesis.

(A) Pairing of maternal and paternal chromosome during zygotene is called synapse - is true.
Zygotene is characterized by pairing of homologous chromosomes called Synapsis. Pairs of homologous chromosomes are called Bivalents.

(B) Chiasmata are the site of crossing over of genetic material - is true.
Chiasmata formation is the result of crossing over and they are the site for genetic material crossing over.

(D) Prophase I is the most complicated and longest stage of meiosis - is true.
Prophase – I is longest and most complex stage of meiosis. Prophase I is classified in five sub stages- leptotene, zygotene, pachytene, diplotene and diakinesis.