Variation + SR (meiosis) Flashcards

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1
Q

Prior to meiosis I

A

The chromosomes which have replicated prior to meiosis I, each consist of 2 genetically identical chromatids attached at the centromere

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2
Q

Meiosis I step 1

A

The chromosomes condense and the homologous chromosomes pair up

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3
Q

Meiosis I step 2

A

Chiasmata form at points of contact between the non-sister chromatids of a homologous pair and sections of DNA are exchanged

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4
Q

Meiosis I step 3

A

This crossing over of DNA is random and produces genetically different recombinant chromosomes

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5
Q

Meiosis I step 4

A

Spindle fibres attach to the homologous pairs and line them up at the equator

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6
Q

Meiosis I step 5

A

The orientation of the pairs of homologous chromosomes at the equator is random

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7
Q

Meiosis I step 6

A

The chromosomes of each homologous pair are separated and move towards opposite poles

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8
Q

Meiosis I step 7

A

Cytokinesis occurs and two daughter cells form

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9
Q

Meiosis II

A

Each of the two cells produced in meiosis I undergoes a further division during which the sister chromatids of each chromosome are separated

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