Zygotene

Describe the following:

(a) synapsis (b) bivalent (c) chiasmata

Draw a diagram to illustrate your answer.

What is the complex formed by a pair of synapsed homologous chromosome called?

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

A bivalent of Meiosis I consist of

1. Four chromatids and two centromeres

2. Two chromatids and one centromere

3. Two chromatids and two centromere

4. Four chromatids and four centromere

1. a male and a female gamete
2. mRNA and ribosomes
3. spindle fibres and centromere
4. two homologous chromosomes

Is crossing over an enzyme-mediated process?

Synaptonemal complex is formed during:

1. Zygotene

2. Diplotene

3. Diakinesis

4. Leptotene

1. Four non-homologous chromatids
2. Four homologous chromosomes with four chromatids
3. Four non-homologous chromosomes
4. Two homologous chromosomes each with two chromatids

Can you recall meiosis and indicate at what stage a recombinant DNA is made?

What is the main structural component of the synaptonemal complex?

Question 24
In which phase of meiosis are the following formed? Choose the answers from hint points given below.
Synaptonemal complex ___

In which phase of meiosis are the following formed? Choose the answers from hint points given below.
Recombination nodules ___

In which phase of meiosis are the following formed? Choose the answers from hint points given below.
Appearance/activation of enzyme recombinase ___

In which phase of meiosis are the following formed? Choose the answers from hint points given below.
Termination of chiasmata ___

In which phase of meiosis are the following formed? Choose the answers from hint points given below.
Interkinesis ___

In which phase of meiosis are the following formed? Choose the answers from hint points given below.
Formation of dyad of cells ___

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

1. Small segments of RNA
2. Small peptides
3. Small DNA segments A
4. Small DNA segments formed over DNA template running in $5^{\prime }\to 3^{\prime }$ direction.

Question 41
Write brief note on the following
Synaptonemal complex

Metaphase plate

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

What Is Synapsis In Zygotene?

Which of the following is not a characteristic feature of mitosis in somatic cells?

1. Synapsis

2. Formation of spindle fibres

3. Disappearance of nucleolus

4. Chromosome movement

1. (i), (ii), (iii) and (iv)
2. (iii) and (iv)
3. (iii) only
4. (iv) only

Give the biological/technical terms for the following:

The stage of cell division in which the nuclear membrane disappears and the chromosomes become short and thick.

1. sister chromatids
2. non-homologous chromosomes
3. sister chromatids of non-homologous chromosomes
4. homologous chromosomes

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

1. Isolation of sex chromosomes
2. Synthesis of DNA and centromere
   
3. Isolation of homologous chromosome
4. Separation of chromatids

What are the mechanisms driving the completion of meiosis 1 related to?

Crossing over occurs during

1. Metaphase I

2. Anaphase II

3. Prophase I

4. Prophase II

1. 46
2. 23
3. 92
4. None

1. two chromatids and one centromere
2. two chromatids and two centromeres
3. four chromatids and two centromeres
4. four chromatids and four centromeres

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

1. (iv), (iii), (ii), (i)
2. (i), (ii), (iii), (iv)
3. (iii), (ii), (i), (iv)
4. (i), (iv), (iii), (ii)

Identify the stages of Prophase I, going from left to right, from the images below.

1. Zygotene, Pachytene, Diplotene, Diakinesis, Leptotene.

2. Diplotene, Diakinesis, Leptotene, Zygotene, Pachytene.

3. Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis.

4. Pachytene, Diplotene, Diakinesis, Pachytene, Diplotene.