The sister chromatids of each chromosome are similar during
I. Beginning of prophase I
II. Beginning of metaphase I
III. End of telophase I

I only

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II only

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III only

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I and II

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II and III

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Solution

The correct option is A I only
Crossing over is the process of exchange of genetic material between non-sister chromatids of homologous chromosomes to produce new genetics combinations or variations. It occurs in pachytene of prophase I after which sister chromatids of chromosomes have different genetic combinations. This makes I correct. II and III are incorrect as by the end of prophase I crossing over has been taken place and metaphase I and telophase I are the follow up stages.
Therefore, the correct answer is option A.

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Q. An identical sister chromatids are present at
I. Beginning of prophase I
II. Beginning of metaphase I
III. End of telophase I

Q. Select the incorrect match regarding mitotic cell division.
(i) Prophase - Chromosomes to begin to uncoil
(ii) Metaphase - Chromatids move apart
(iii) Telophase - The nuclear membrane reappears
(iv) Late anaphase- Each chromosome consists of two anaphase chromatids
(v) Interphase - Chromosomes are not distinct

Q. Match the following columns w.r.t. mitosis and select the correct option.

	Column I		Column II
(a)	Prophase	(i)	Re-appearance of nuclear membrane
(b)	Metaphase	(ii)	Condensation of chromatin
(c)	Anaphase	(iii)	Separation of chromatids
(d)	Telophase	(iv)	Chromosomes align on equator

Q. Match list I and list II and select the correct answer.

\begin{matrix} List I & List II (Phase of meiosis) & (Event that occurs) 1 & Prophase I & Crossing over occurs 2 & Metaphase II & Sister chromatids migrate to opposite poles 3 & Anaphase I & Homologous chromosomes line up at equator in pairs \end{matrix}

Match the following stages during Mitotic cell division with the key changes:

$\begin{matrix} Column I & Column II i. Prophase & a. Formation of 2 daughter cells, preparation for next division. ii. Metaphase & b. Organelles disappear, formation of chromosomes. iii. Anaphase & c. Spindle fibres, chromosomes at equatorial plate. iv. Telophase & d. Splitting of chromatids, chromosomes move towards poles. v. Interphase & e. Spindle fibres disappear, Cytokinesis follows. \end{matrix}$

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The sister chromatids of each chromosome are similar duringI. Beginning of prophase III. Beginning of metaphase IIII. End of telophase I

The sister chromatids of each chromosome are similar during
I. Beginning of prophase I
II. Beginning of metaphase I
III. End of telophase I