Meiosis 1 MS

Question 1

interphase

Answer 1

• DNA unravels and replicates
• produces double-armed chromosomes called sister chromatids

Question 2

prophase I

Answer 2

• chromosomes condense
  
  • shorter and fatter
• arrange themselves in homologous pairs
• crossing-over occurs
• cnetrioles start moving to poles, forming spidle fibre
• nuclear envelope breaks down

Question 3

homologous pairs

Answer 3

• pairs of chromosomes
• one from each parent
• same genes, different allelels

Question 4

metaphase I

Answer 4

• homologous pairs line up across the centre
• attach to spindle fibre by centromeres

Question 5

anaphase I

Answer 5

• spindles ontract
• seperate homolgous pairs
• one chromosome goes to each end
• independant assortment

Question 6

telophase I

Answer 6

• nuclear envelope forms around each group
• cytokensis

Question 7

what is the differnece from mitosis and meisos II

Answer 7

• anaphase II
  
  • pairs of sister chromatids are seperated
  • each new daughter cell inherits one chromatid from each chromosome
  • four hapolid daughter cells produced, genetically differe