BIOL 180 Chapter Notes - Chapter 12: Tubulin, Sister Chromatids, Spindle Apparatus

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burgundykoala602

15 Apr 2016

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Department

Biology

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BIOL 180

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Freeman Scott

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BIOL 180 Full Course Notes

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M phase consists of two distinct events: (1) division of nucleus (2) division of cytoplasm. During cell replication mitosis divides replicated chromosomes to form two daughter nuclei with identical chromosomes and genes: usually accompanied by cytokinesis - cytoplasmic division resulting in two daughter cells. Process of how chromosomes change before, during and after mitosis and cytokinesis begins with hypothetical plant/animal cell g1 phase (chromosome number varies widely among species) Eukaryotic chromosomes consist of dna wrapped around globular histone proteins: dna-protein material is a chromatin. During interphase chromatin of each chromosome"s in a relaxed uncondensed state: forms long, thin strands. Start of mitosis: each chromosome consists of two sister chromatids attached to each other at centromere. After mitosis: each chromosome now consists of two sister chromatids. Each chromatid contains one long dna double helix. Sister chromatids represent exact copies of the same genetic information. Mitosis begins when chromatin condenses to form much more compact structure: condensed chromosomes correspond to paired threads.

Related Questions

5- Somatic ("body") cells are _______________ (2n). This means there are two copies of each chromosome.

6- During the _______ phase(s) cells perform their everyday functions.

7- When chromosomes are duplicated the two strands are called _______________________________ and they are linked together at a point called the ____________________.

sister strands; kinetochore

sister chromatids; centromere

dual chromatids; centromere

genes; chromatid

8- New somatic âbodyâ cells are formed by this process:

meiosis

binary fission

replication

mitosis

9- The cytoplasmic division of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells.

10- Cells replicate their DNA during ________________ phase.

byzantiumlion207

1- Most of a cell's life is spend in this phase of the cell cycle:

--------------------

2- The cell cycle is a highly regulated process.

True

False

3- Cells replicate their DNA during ________________ phase.

4- In animal cells, ________________________ is the indentation of the cell's surface that marks cytokinesis, the final splitting of the membrane, in the process of cell division.

cleavage furrow

binary fission

cell plate

sister chromatids

5- Somatic ("body") cells are _______________ (2n). This means there are two copies of each chromosome.

6- During the _______ phase(s) cells perform their everyday functions.

7- When chromosomes are duplicated the two strands are called _______________________________ and they are linked together at a point called the ____________________.

sister strands; kinetochore

sister chromatids; centromere

dual chromatids; centromere

genes; chromatid

8- New somatic âbodyâ cells are formed by this process:

meiosis

binary fission

replication

mitosis

9- The cytoplasmic division of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells.

10- Cells replicate their DNA during ________________ phase.

pucecat917

Each chromosome consists of only one centromere, but during certain times in the cell cycle could consist of two DNA molecules (sister chromatids). If a cell in G1 of interphase has 14 chromosomes, answer the following questions:

1. In G2 of interphase how many chromosomes will be found per cell?

2. In G2 of interphase how many DNA molecules will be found per cell?

3. After teleophase I of meiosis how many chromosomes will be found per cell?

4. After teleophase I of meiosis how many DNA molecules will be found per cell?

5. After cytokinesis of mitosis how many chromosomes will be found per cell?

6. After cytokinesis of meiosis II how many DNA molecules will be found per cell?

A. 14

B. 42

C. 28

D. 7

E. 56

BIOL 180 Chapter Notes - Chapter 12: Tubulin, Sister Chromatids, Spindle Apparatus

BIOL 180 Full Course Notes

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