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10. Cell Cycle > 4.1 Meiosis-I > Flashcards

4.1 Meiosis-I Flashcards

1
Q

Topic - Prophase-I

A
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2
Q

The Prophase of the first meiotic division is the same compared to prophase of mitosis.
T/F

A

False,
Prophase of the first meiotic division is typically longer and more complex.

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3
Q

Based on chromosomal behavior, Prophase-I is divided into:

A

I. Leptotene
II. Zygotene
III. Pachytene
IV. Diplotene
V. Diakinesis

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4
Q

Topic - Leptotene (Leptonema)

A
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5
Q

The chromosomes become gradually visible under the light microscope.
T/F

A

True

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6
Q

The compaction of chromosomes continues throughout leptotene.
T/F

A

True

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7
Q

Key events of Leptotene:

A

I. Chromatin fibers become long slender chromosomes.
II. Nucleus enlarges.

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8
Q

Topic - Zygotene (Zygonema)

A
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9
Q

Similar chromosomes start ______ (splitting/pairing) together.
This process of pairing is called ______.

A

pairing; synapsis

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10
Q

Chromosome synapsis is accompanied by the formation of a complex structure called.

A

Synaptonemal complex

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11
Q

The paired chromosomes are called.

A

Homologous chromosomes

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12
Q

The complex formed by a pair of synapsed homologous chromosomes is called ______, which is more clearly visible in the next stage (Pachytene).

A

Bivalent or tetrad

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13
Q

The two short-lived stages of prophase-I are _____ and _____ compared to Pachytene.

A

Leptotene and zygotene

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14
Q

Topic - Pachytene (Pachynema)

A
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15
Q

Four chromatids of each bivalent chromosome become distinct and clearly appear as

A

Tetrads

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16
Q

The Pachytene stage is characterized by the appearance of ______.

A

Recombination nodules (Sites at which crossing over occurs)

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17
Q

The sites at which crossing over occurs between non-sister chromatids of the homologous chromosomes are called.

A

Recombination nodules

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18
Q

The process of exchanging genetic material between two homologous chromosomes is called.

A

Crossing over

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19
Q

Crossing over is also an enzyme-mediated process, and the name of the enzyme is called.

A

Recombinase

20
Q

Crossing over leads to the recombination of genetic material on the two chromosomes.
T/F

A

True

21
Q

At the end of pachytene, recombination between homologous chromosomes is completed which leaves the chromosomes linked at the sites of crossing over.
T/F

A

True

22
Q

Topic - Diplotene (Diplonema)

A
23
Q

What happens at the beginning of the Diplotene stage?

A

The dissolution of the synaptonemal complex occurs.

24
Q

The tendency of homologous chromosomes of bivalent to separate from each other except at the site of _____.

A

crossovers

25
Q

The X-shaped structure formed after crossing over is called.

A

Chiasmata

26
Q

Diplotene can last for months or years in ______ of some vertebrates.

A

Oocytes

27
Q

Topic - Diakinesis

A
28
Q

Diakinesis is marked by -

A

Terminalisation of chiasmata

29
Q

In Diakinesis, chromosomes are fully condensed.
T/F

A

True

30
Q

The meiotic spindle is assembled to prepare the homologous chromosomes for ______.

A

separation

31
Q

By the end of diakinesis, ______ disappears, and ______ also breaks down.

A

Nucleolus; Nuclear envelope

32
Q

Diakinesis represents a transition to metaphase.
T/F

A

True

33
Q

Topic - Metaphase-I

A
34
Q

In Metaphase-I, Spindle formation is completed.
T/F

A

True

35
Q

The bivalent chromosomes align on the equatorial plate.
T/F

A

True

36
Q

______ from the opposite poles of the spindle attach to the kinetochore of homologous chromosomes.

A

Microtubules

37
Q

Topic - Anaphase-I

A
38
Q

Main events of Anaphase-I :

A

I. Homologous chromosomes separate
II. Sister chromatids remain associated at their centromeres.

39
Q

Topic - Telophase-I

A
40
Q

In Telophase-I, ______ and ______ reappear.

A

Nuclear membrane; Nucleolus

41
Q

______ is called when two haploid daughter nuclei are formed, then cytokinesis happens.

A

Dyad of cells (Diad)

42
Q

Although, in many cases, the chromosomes do undergo some dispersion. They do not reach the extremely extended state of the interphase nucleus.
T/F

A

True

43
Q

The short-lived stage between two meiotic divisions is called.

A

Interkinesis

44
Q

There is no replication of DNA during interkinesis.
T/F

A

True

45
Q

Prophase-II follows Interkinesis
T/F

A

True

10. Cell Cycle (13 decks)

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