Prophase I

Q.

What are the stages of mitosis And meiosis?

Q. For the formation of 50 seeds how many minimum meiotic divisions are necessary?

Q. How many meiosis are required to produce 50 seeds of tobacco?(Steps)?

Q.

Dissolution of synaptonemal complex occurs during

1. Diplotene

2. Leptotene

3. Pachytene

4. Zygotene

Q. When does DNA replication take place during meiosis?

1. Before Prophase I
2. Before Prophase II
3. Both (a) and (b)
4. DNA replication occurs during meiosis

Q. Match the stages of meiosis in Column I to their characteristic features in Column II and select the correct option using the codes given below:

1. a-->iv., b-->iii., c-->ii., d-->i
2. a-->ii., b-->iv., c-->iii., d-->i
3. a-->iii., b-->iv., c-->ii., d-->i
4. a-->i., b-->iv., c-->ii., d-->iii

Q.

What happens during synapsis in meiosis?

Q.

What is the difference between recombination and mutation?

Q. The correct sequence of phases occuring during prophase-I of meiosis-I is:

1. Zygotene, leptotene, Diplotene, Diakinesis, Pachytene
2. Leptotene, Zygotene, Diplotene, Diakinesis, Pachytene
3. Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis
4. Leptotene, Zygotene, Pachytene, Diakinesis, Diplotene

Q.

State whether the following statement is true or false.

Crossing-over between chromatids can occur only between homologous chromosomes.

1. True
2. False

Q. Meiosis results in

1. Production of gametes
2. Reduction in the number of chromosomes
3. All of the above
4. Introduction of variation

Q.

Why do eukaryotes need mitosis?

Q. In which stage of the cell cycle the chromosomes are maximally condensed
(1)prophase
(2)metaphase
(3)anaphase
(4)telophase

Q.

Match the following and choose the correct option -

Column l Column ll

a.Isogamy1.Male and female gamates are different

b.Anisogamy2.Female gamete is non-motile

c.Oogamy3.Gametes are identical

1. a2, b1, c3

2. a3, b1, c2

3. a1, b2, c3

4. a3, b2, c1

Q.

Distinguish anaphase of mitosis from anaphase I of meiosis.

Q.

Choose the odd one out of the following terms given and name the category to which others belong:

(i) Aster, chromosome, spindle fibres, cytokinesis, centromere

Q.

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. If the female gamete of plant species has 4 chromosomes then its parental cell will have how many
(1)bivalent
(2)tetrads

Q.

Question 18

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

Q. Microtubules from opposite poles of spindle get attached to kinetochores of sister chromatids during

1. anaphase II
2. prophase II
3. metaphase II
4. metaphase I

Q. Given below are some statements related to the dihybrid cross performed by Morgan (considering the body colour and eye colour as the two characters for study). Which of the following would you choose to find out the location of the gene for body colour?

I. Deviation of $F_2$ progeny from the usual 9:3:3:1 ratio
II. Appearance of more parental combinations in $F_2$ generation
III. Appearance of more non-parental combinations in $F_2$ generation
IV. Linked inheritance of body colour and eye colour in Drosophila

1. I and III only
2. I, II, and III
3. I, II, and IV
4. II and IV only

Q.

Does DNA replicate during interkinesis?

Q.

Which of the following chromosomal mutation are most likely to take place when homologous chromosomes are undergoing synapsis?

1. Inversion and translocation

2. Deletion and duplication

3. Inversion and deletion

4. Translocation and duplication

Q. Explain the stages of prophase I of meiosis.

Q. If two daughter cells are formed during mitosis, how are DNA and chromosomes distributed?

Q. During meiosis, crossing over occurs at

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

Q.

Crossing over in diploid organisms results in

1. Independent assortment

2. Recombination of linked genes

3. Dominance of genes

4. Segregation of alleles

Q.

What happens in zygotene of prophase I?

Q. What is the correct sequence of stages in Prophase I of meiosis?

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

Q. Pick out the item which has sequential arrangement.
i) $Zygotene\to Leptotene\to Pachytene\to Diplotene\to Diakinesis$.
ii)$Diakinesis\to Zygotene\to Leptotene\to Pachytene\to Diplotene$.
iii)$Leptotene\to Zygotene\to Pachytene\to Diplotene\to Diakinesis.$