Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Cell Cycle > Meiosis > Flashcards

Meiosis Flashcards

1
Q

Meiosis definition

A

Reduces the chromosome no. By half results in production of haploid daughter cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Meiosis ensures
Fertilisation restores

A

The production of haploid phase
The diploid phase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Meiosis -1 also known as

A

Heterotypic division or reduction division
Leads to reduction in chromosome no

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Division of chromosome doesn’t occur in

A

Meiosis - I

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Prophase-i

A

Longer and more complex than mitosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Leptotene
Chromatin
Chromosome

A

Chromatin threads condense to form chromosome
Longest and thinnest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Bouquet stage

A

Leptotene
All chromosome in nucleus remain directed towards centrioles, so group of chromosomes in nucleus appears like a bouquet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Zygotene (synapsis)
Characterised by

A

Synaptotene
Characterized by pairing of homologous chromosome

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Pairs of chromosomes are called
Clearly Visible in

A

Bivalent’s (2 chromosome] OR. Tetrads (4 chromatids)
Next stage patchytene
Zygotene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Synaptonemal complex

A

A structure develops in between homologous chromosomes
Zygotene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Duration of first 2 shags of prophase 1

A

Relatively short lived compared to patchytene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Non sister chromatids

A

2 chromatids of ( homologous chromosome )

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Pachytene
chromatids clearly apper as

A

Tetras

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Recombination modules

A

B/n non sister chromatids of homologous pair develop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Crossing over

A

Non sister chromatid exchange their part
Pachytene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Crossing over leads to

A

Recombination of genetic material on two chromosome

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Crossing over enzyme

A

Recombines ( endonucleuse [cut] + ligase [to fix ] )

18
Q

Leaving the chromosome linked at sites of crossing over

A

Pachytene
Recombination

19
Q

Diploteme beginning

A

Recognised by dissolution of synaptonemal complex

20
Q

The tendency of recombined homologous

A

Of bivalents to separate from each other except at sites of crossovers
Diplotene

21
Q

Diplotene stage

A

Oocytes of some vertebrate
Diplotene last up to months or years

22
Q

Chiasmata

A

Sites of crossovers x shaped structure

23
Q

Diakinesis is marked by

A

Terminalization of chiasmata (chaismata open in zip like manner)

24
Q

Diakinesis
Chromosomes
Meiotic spindle

A

Fully condensed
Is assembled to prepare the homologous chromosome for separation

25
Q

By the end of diakinesis

A

Nucleolus disappear and nuclear envelop breaks down

26
Q

Metaphase I

A

Bivalent chromosome align on equatorial plate
The microtubuse from the opposite poles of spindle attach to kinetochore of homologous chromo

27
Q

Anaphase I homo chromo
Sister chromatid

A

Due to shortening of Kinect o chore homo chromo seperate from each other and move towards opposite poles
Remain associated at their centromere ( chromosome remain in double chromatid condition)

28
Q

Anaphase I characterised
Pyoidy level

A

Segregation or disjunction of chromosome
Division of centromere absent
Diploid → haploid

29
Q

Telophase. I

A

Nuclear me.m. Nucleolus reappear

30
Q

Dyad of cells

A

Cyto kinesis follows telophase - I and a diploid (2n) cell divides into two ha.ploid(n) daughter cells

31
Q

Interkinesis

A

GOP b/w meiosis I and meiosis ii
Replication of DNA absent

32
Q

Prophase Il

A

Nuclear mem disappear by end of prophase Il
Chromosome again becomes compact

33
Q

Metaphase ii

A

Chromosome align at equator
Microtubules from opposite pole of spindle get attached to kinetochore of sister chromatids

34
Q

Anaphase Il

A

Splitting of centromere of each chromosome
Move towards opposite poles of cell by shortening of microtubules attached. 1.0 kineto chore

35
Q

Telophase ll

A

Two groups of chromosome once again get enclosed by a nuclear envelope

36
Q

Cytokinesis results

A

Formation of tetras of cells i.e four haploid daughter cell

37
Q

Meiosis is mechanism

A

Conservation of specific chromosome no

38
Q

Meiosis increases

A

Genetic variability
Variation are very important for process of evolution

39
Q

Meiosis Il

A

Homotypic division

40
Q

Meiosis
Division of nucleus
Division of chromosome

A

Takes place twice
Occurs only once in anaphase of meiosis ii

Cell Cycle (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions