Скачать или смотреть 150918 Test 1 Review

Somehow the order of events in this recording was scrambled, so the events below did not actually happen in this order in class:
0:00 Google Classroom Assignment (due 9/17/15) key - Question 1
2:00 Question 2 (start)
3:25 the conflict: if we’re diploid, how could one of our cells have four copies of a chromosome?
6:17 –
8:30 Question about whether BLAST questions could be on the exam
9:02 Format of the exam - check Blackboard announcement
17:33 About the different shapes of chromosomes at metaphase; role of cohesin
18:45 end
18:46 Karyograms and the role of cohesin in the shapes of chromosomes: “sticks” vs “X”s
21:12 Interpreting FISH experiments and metaphase spreads; ploidy at metaphase
28:51 Can you assume that all chromosomes shown are all of the chromosomes from a metaphase spread, or might there be some chromosomes that are just not shown?
30:16 Ploidy, revisited
31:28 chromosome fission and the centromere (related to the study guide)
32:10 Question 2 (related): Cell cycle and ploidy: diploids become temporarily tetraploid after synthesis and before mitosis.
33:22 Why are there eight double-helices on this slide?
35:08 The cell cycle, DNA replication, and ploidy
37:16 Question 3: Are homologous chromosomes identical?
39:10 Ploidy at interphase before synthesis - when ploidy is defined (diploid, here)
39:55 What is ploidy after S phase? tetraploid
40:54 at M phase, chromosomes segregate into daughter cells and restore diploidy
43:03 What happens if a chromosome breaks at its centromere? What happens to acentric chromosomes (fragments lacking a centromere)? Dicentric chromosomes (chromosomes that have two centromeres)?