In which stage(s) of the cell cycle, mitosis or meiosis  do each of these processes occur (multiple stages apply to some) Crossing-over:  Chromosome supercoiling:  Separation of sister chromatids:  DNA synthesis:  Chromosome reduction from 2N to N:

Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
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Chapter8: Dna Structure And Function
Section: Chapter Questions
Problem 6SQ: The chromosome number ______. a. refers to a particular chromosome in a cell b. is a characteristic...
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  1. In which stage(s) of the cell cycle, mitosis or meiosis 

do each of these processes occur (multiple stages apply to some)

  1. Crossing-over: 
  2. Chromosome supercoiling: 
  3. Separation of sister chromatids: 
  4. DNA synthesis: 
  5. Chromosome reduction from 2N to N: 

 

4. A previously undiscovered single celled organism was found living at a great depth on the ocean floor. Its nucleus contains only a single, linear chromosome consisting of  7x10^6 nucleotide pairs of DNA coalesced with three types of histone-like proteins. The analysis of individual nucleosomes revealed that each unit contained one copy of each protein and that the short linker DNA had no protein bound to it If the entire chromosome consists of nucleosomes (discounting any linker DNA), how many are there and how many total proteins are needed to form them?




2. Complete the following table. A single value is given for each of five species (A-E); fil in the
rest of the values for each species. However: one species' values are not possible!
Chromosome #s in each species
Species Species Species Species Species
A
B
E
N:
4
2N:
6.
# pairs of
homologous
C'somes:
# sister
chromatids
10
during prophase:
# of bivalents
12
during meiosis:
# sister
chromatids
during
metaphase-II:
The value for which species is not possible?
Explain why:
3. How many chromosomes are shown in the picture below? How many chromatids?
Transcribed Image Text:2. Complete the following table. A single value is given for each of five species (A-E); fil in the rest of the values for each species. However: one species' values are not possible! Chromosome #s in each species Species Species Species Species Species A B E N: 4 2N: 6. # pairs of homologous C'somes: # sister chromatids 10 during prophase: # of bivalents 12 during meiosis: # sister chromatids during metaphase-II: The value for which species is not possible? Explain why: 3. How many chromosomes are shown in the picture below? How many chromatids?
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