stages Flashcards

1
Q

interphase

A

synthesis of proteins, organelles, ATP

DNA replication phase - S-phase

DNA present in decondensed form

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

prophase I

A

chromatin condenses into chromosomes

homologous chromosomes will pair up, we call them bivalents

homologous chromosomes exchange DNA by forming chiasma - crossing over - increases genetic variation

nuclear membrane disintegrates

centrioles move towards opposite poles

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

metaphase I

A

bivalents line up along the equatorial plane of the cells

spindle fibres attach from the centrioles to the centromere of each chromosome

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

anaphase I

A

spindle fibres contract

one chromosome from each homologous pair is pulled to opposite poles

independent assortment of chromosomes - cause of genetic variation

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

telophase

A

new nuclear envelopes are formed (phospholipid synthesis)

centrioles are replicated

chromosomes start to decondense

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

cytokinesis I

A

a cleavage furrow is formed

phospholipids are added to make new cell membrane to separate the two cells

chromosomes decondense and become thread-like (chromatin)

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

end of meiosis I

A

two daughter cells

go into prophase II without doing interphase

plane of division in II is right angle to plane of division in I

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

prophase II

A

chromosomes become condensed into individual chromosomes

each chromosomes consists of a centromere with two chromatids attached - only one chromosome from each pair

the nuclear envelop starts to disappear

centrioles become prominent and move to opposite poles

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

metaphase II

A

chromosomes line up along the equatorial plane of the cell

spindle fibres attach from the centrioles to the centromere of each chromosome

the nuclear envelope is lost completely

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

anaphase II

A

the spindle fibres contract

the centromeres are split

chromatids from each chromosome are pulled towards opposite poles

known as independent assortment of chromatids - cause of genetic variation

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

telophase II

A

new nuclear envelops are formed (phospholipid synthesis)

centrioles are replicated

chromosomes start to decondense

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

cytokinesis II

A

a cleavage furrow is formed

phospholipids are added to make new cell membrane to separate the two cells

chromosomes decondense and become thread-like (chromatin)

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