meiosis stage 2

Question 1

what happens during prophase 2

Answer 1

-centrioles replicate and move to poles
-new spindle fibres form at right angles to previous spindle axis
-nucleur envelope that may have reformed breaks down
-chromosomes condense and coil, each consisting of 2 chromatids

Question 2

what happens during metaphase 2

Answer 2

-chromosomes attach by centromere to equator of spindle
-chromatids of each chromosome are randomly arranged

Question 3

what happens during anaphase 2

Answer 3

-the centromeres divide
-the chromatids of each chromosome are pulled apart by motor protiens along tubulin threads to opposite poles
-chromatids therefore randomly segregated

Question 4

what happens during telophase 2

Answer 4

-nucleur envelope forkms around each of 4 haploid nuclei
-in animals, 2 cells divide to give 4 haploid cells
-in plants, a terad of 4 haploid are formed

Question 5

when does independent assortment of chromatids happen

Answer 5

-during metaphase 2

Question 6

what is independent assortment of chromatids

Answer 6

• random distribution of sister chromatids into daughter cells during meiosis II
  -there is no set pattern as to whether maternal or paternal chromatid of chromosome will face one pole or the other

Question 7

sister chromatids in independent assortment of chromatids

Answer 7

despite having diff alleles they are still considered sister chromatids because they originate from the same chromosome

Question 8

why does random assortment of chromosomes not happen in metaphase II

Answer 8

-there are no homologous chromosomes to assort independently