Question 18

The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?

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Solution

The homologous chromosomes lie parallel to each other in leptotene stage. Each chromosome has four chromatids and are bivalent. The non-sister chromatids of homologous chromosomes cross over in pachytene stage of prophase- I.

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Question 6
A bivalent meiosis- I consists of
(a) two chromatids and one centromere
(b) two chromatids and two centromeres
(c) four chromatids and two centromeres
(d) four chromatids and four centromeres

Q. Calculate the number of chromatids if a cell has 20 bivalents in prophase I.

Q. Which of the following statements hold true for bivalents?
(i) Generally a bivalent is an association of four chromatids and two centromere.
(ii) It is a homologous chromosome.
(iii) Crossing over occurs between two different kinds of bivalents.

Q. Choose the correct answers from the alternatives given :
During prophase I of meiosis homologous chromosomes pair with each other to form bivalents A bivalent is an association of

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}

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Question 18 The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?

The homologous chromosomes lie parallel to each other in leptotene stage. Each chromosome has four chromatids and are bivalent. The non-sister chromatids of homologous chromosomes cross over in pachytene stage of prophase- I.

Question 18

The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?