Leptotene

Q.

The major events which occur during the anaphase of mitosis which bring about equal distribution of chromosomes is

1. Condensation of the chromatin

2. Replication of the genetic material

3. Splitting of the centromeres

4. Splitting of the chromatids

Q. _______ is the short pause which separates meiosis I and meiosis II.

1. $G_2$ phase
2. S phase
3. $G_1$ phase
4. Interkinesis

Q.

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

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

1. i).$\to$ e., ii).$\to$ b., iii).$\to$ d., iv). $\to$ c., v). $\to$ a.

2. i).$\to$ d., ii).$\to$ b., iii).$\to$ e., iv). $\to$ a., v). $\to$ c.

3. i).$\to$ c., ii).$\to$ d., iii).$\to$ a., iv). $\to$ b., v). $\to$ e.

4. i).$\to$ a., ii).$\to$ e., iii).$\to$ c., iv). $\to$ d., v). $\to$ b.

Q.

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres.

1. Metaphase II

2. Anaphase II

3. Anaphase I

4. Metaphase I

Q. The chromosomes appears as long thin threads in

1. Leptotene
   
2. Zygotene
   
3. Pachytene
   
4. Diplotene

Q. bead like thickened portions of leptotene chromosomes are known as. ?