Zygotene of prophase I is characterized by

chromomeres

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synaptonemal complex

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crossing over

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terminalisation of chiasmata

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Solution

The correct option is B synaptonemal complex
Zyotene: It is characterized by pairing of homologous chromosomes (synapsis). During this stage, structure develops in between homologous chromosomes which is termed as synaptonemal complex. The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad.

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Similar questions

Match the substages of prophase I of first meiotic division listed in column I with the important events pertaining to respective stages given under column II; choose the answer which gives the correct combination of alphabets of the two columns:

$\begin{matrix} C o l u m n I S u b s t a g e s o f p r o p h a s e I & C o l u m n I I I m p o r t a n t e v e n t s A & Zygotene & p & Chromomeres B & Pachytene & q & Bivalents migrate to periphery C & Diplotene & r & Terminalization of chiasmata begins D & Diakinesis & s & Crossing over t & Synapsis \end{matrix}$

Match the following stages during Prophase I with their key changes:

$\begin{matrix} Column I & Column II i. Leptotene & a. Bivalents separate and remain attached at Chiasmata. ii. Zygotene & b. Pairing of opposite chromosomes. iii. Pachytene & c.Bivalents divide and remain attached at Chiasmata. iv. Diplotene & d. Bivalents are formed and crossing over is seen. v. Diakinesis & e. Chromosomes are formed and in condensed stage. \end{matrix}$

Q. Match the column:

(a) Pachytene	(i) Pairing of homologous chromosomes
(b) Metaphase I	(ii) Terminalisation of chiasmata
(c) Diakinesis	(iii) Cross-over takes place
(d) Zygotene	(iv) Chromosomes align at equatorial plate

Q. Assertion :The final stage of meiotic prophase I is diplotene. Reason: Diplotene is marked by terminalisation of chiasmata.

$\begin{matrix} C o l u m n I S u b s t a g e s o f p r o p h a s e I & C o l u m n I I I m p o r t a n t e v e n t s A & Z y g o t e n e & p & C h r o m o m e r e s B & P a c h y t e n e & q & B i v a l e n t s m i g r a t e t o p e r i p h e r y C & D i p l o t e n e & r & T e r m i n a l i z a t i o n o f c h i a s m a t a b e g i n s D & D i a k i n e s i s & s & C r o s s i n g o v e r t & S y n a p s i s \end{matrix}$

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