Cell Cycle And DNA Replication at University Of Brighton | Flashcards & Summaries

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Lernmaterialien für cell cycle and DNA replication an der University of Brighton

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what is a gene 

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a section of DNA that codes for one polypeptide

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what happens at anaphase

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1) The spindle fibers contract / shorten. 
2) The centromere splits 
3) The identical sister chromatids are pulled to opposite poles 
4) making a “V” shape

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Describe the appearance and behavior of chromosomes during mitosis

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1. During prophase, chromosomes supercoil and condense to become visible; 
2. Chromosomes appear as 2 identical sister chromatids joined by a centromere; 
3. During metaphase chromosomes line up on the equator of the cell; 
4. Chromosomes attach to the spindle fibers; 
5. By their centromeres; 
6. During anaphase, the centromere splits; 
7. Sister chromatids are pulled to opposite poles of the cell making a V shape; 
8. During telophase, chromatids uncoil and become thinner;

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what do Proto-onco genes do

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code for proteins that speed up the cell cycle.

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is crossing over rare or common

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RARE

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wt happens during meiosis 1

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• Crossing over between non-sister chromatids of homologous chromosomes. 
• Independent segregation of homologous chromosomes during meiosis.

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what are the characteristics of the 2 daughter cells in DNA replication

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  1. genetically identical
  2. No variation occurs
  3. same number of chromosomes as the parent cell.
  4. same alleles of the same genes in the same gene loci.
  5. genetic clones
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describe the structire of the chromosone

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  1. attached at a central point called the centromere.
  2. Each of the DNA copies now supercoils (using histone proteins to help them coil in eukaryotes).
  3. While they are still joined, the two condensed DNA molecules are called identical sister chromatids.
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TESTE DEIN WISSEN

what occurs in semi conversative replication of DNA

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  1. DNA molecules are replicated
  2. identical copies separated and are passed on to the two daughter cells.
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d all cells undergo all parts of the cell cycle

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  1. Some differentiated cells cannot undergo cell division to produced more identical cells of that type
  2. (eg red blood cells cannot go through cell cycle and divide to produce more red blood cells, they must be made by the bone marrow
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what is the purpose of mitosis

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• Increasing cell numbers and growth of an organism
• Repair of damaged tissues (not cells)
• Replacement of worn out/ dead cells

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How many chromosomes do haploid cells have 

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23 of gametes

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Beispielhafte Karteikarten für deinen cell cycle and DNA replication Kurs an der University of Brighton - von Kommilitonen auf StudySmarter erstellt!

Q:

what is a gene 

A:

a section of DNA that codes for one polypeptide

Q:

what happens at anaphase

A:

1) The spindle fibers contract / shorten. 
2) The centromere splits 
3) The identical sister chromatids are pulled to opposite poles 
4) making a “V” shape

Q:

Describe the appearance and behavior of chromosomes during mitosis

A:

1. During prophase, chromosomes supercoil and condense to become visible; 
2. Chromosomes appear as 2 identical sister chromatids joined by a centromere; 
3. During metaphase chromosomes line up on the equator of the cell; 
4. Chromosomes attach to the spindle fibers; 
5. By their centromeres; 
6. During anaphase, the centromere splits; 
7. Sister chromatids are pulled to opposite poles of the cell making a V shape; 
8. During telophase, chromatids uncoil and become thinner;

Q:

what do Proto-onco genes do

A:

code for proteins that speed up the cell cycle.

Q:

is crossing over rare or common

A:

RARE

Mehr Karteikarten anzeigen
Q:

wt happens during meiosis 1

A:

• Crossing over between non-sister chromatids of homologous chromosomes. 
• Independent segregation of homologous chromosomes during meiosis.

Q:

what are the characteristics of the 2 daughter cells in DNA replication

A:
  1. genetically identical
  2. No variation occurs
  3. same number of chromosomes as the parent cell.
  4. same alleles of the same genes in the same gene loci.
  5. genetic clones
Q:

describe the structire of the chromosone

A:
  1. attached at a central point called the centromere.
  2. Each of the DNA copies now supercoils (using histone proteins to help them coil in eukaryotes).
  3. While they are still joined, the two condensed DNA molecules are called identical sister chromatids.
Q:

what occurs in semi conversative replication of DNA

A:
  1. DNA molecules are replicated
  2. identical copies separated and are passed on to the two daughter cells.
Q:

d all cells undergo all parts of the cell cycle

A:
  1. Some differentiated cells cannot undergo cell division to produced more identical cells of that type
  2. (eg red blood cells cannot go through cell cycle and divide to produce more red blood cells, they must be made by the bone marrow
Q:

what is the purpose of mitosis

A:

• Increasing cell numbers and growth of an organism
• Repair of damaged tissues (not cells)
• Replacement of worn out/ dead cells

Q:

How many chromosomes do haploid cells have 

A:

23 of gametes

cell cycle and DNA replication

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