Meiosis 0.0 / 5 ? BiologyCellular processesA2/A-levelAQA Created by: LCreated on: 21-01-14 15:17 When homologous pairs line up next to eachother they form a.... Bivalent 1 of 12 Crossing over occurs in... Prophase I 2 of 12 The points at which the chromatids cross over are called... Chiasmata 3 of 12 How many phases of meiosis are there? 2 - Meiosis I and Meiosis II 4 of 12 What does meiosis produce? 4 halpoid daughter cells - gametes 5 of 12 Why does meiosis only produce haploid cells? Because when the gametes fuse during fertilisation the zygote produced will be diploid and have the correct number of chromosomes 6 of 12 How many chromosomes should human cells have? 46 - 23 pairs 7 of 12 What would an XY chromosome pairing indicate? XY = male, ** = female 8 of 12 In prophase II, what process does NOT occur that happened in prophase I? Crossing over 9 of 12 If there is a short interphase between meiosis I and II, then _______ does not occur. DNA replication: there is no 'S' phase 10 of 12 Meiosis occurs to produce what kind of cells? Gametes (sex cells) 11 of 12 Why does crossing over happen? To increase genetic variation - mixing genes 12 of 12
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