Chapter 2 - Meiosis stages

Question 1

Prophase 1

Answer 1

• Chromatin threads condense into chromosomes
• Nuclear membrane breaks down (nucleolus disappears)
• Spindle fibres begin to form, attaching to each chromosome at centromere
• Centrosomes move to poles
• Synapses and crossing over occurs

Question 2

Metaphase 1

Answer 2

• Maternal and paternal chromosomes move to equator (metaphase plate)
• Lining up of homologous chromosomes in metaphase one called independent assortment, resulting in random assortment of chromosomes
• Spindle fibres are attached to centimetres

Question 3

Anaphase 1

Answer 3

• Spindle fibres shorten, pulling on the centromere of each chromosome. Sister chromatids remain attached
• Random combination of maternal and paternal chromosomes dragged to each pole

Question 4

Telophase 1

Answer 4

• New nuclear membranes form and chromosomes uncoil

- Spindle fibres disintegrate

Question 5

Cytokinesis 1

Answer 5

Cell splits into two haploid cells. Contain one chromosome from each pair of homologous chromosomes

Question 6

Prophase 2

Answer 6

• Chromatin condenses
• Spindle fibres produced
• Nuclear membrane disintegrates

Question 7

Metaphase 2

Answer 7

• Chromosomes line up along the equator

- Spindle fibres attach to sister chromatids

Question 8

Anaphase 2

Answer 8

• Spindle fibres pull new chromosomes to poles, sister chromatids separate
• In animal cells, cleavage furrow forms, in plant cells cell plates forms

Question 9

Telophase 2

Answer 9

• Chromosomes form chromatin

- For new nuclear mains membranes form, one in each daughter cell

Question 10

Cytokinesis 2

Answer 10

• Cells separates into four non-identical haploid daughter cells

Question 11

what are the differences between meiosis 1 and 2

Answer 11