BIOSC-116 Lecture Notes - Lecture 7: Microtubule, Centrosome, Interphase

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coppermule660

16 Jun 2020

School

Diablo Valley College

Department

Biological Science

Course

BIOSC-116

Professor

Khan

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Document Summary

Interphase is a period of active growth broken into 3 distinct stages: growth 1 (g1, synthesis (s) center by a centromere are long strands original, growth 2 (g2) illustrations depict dna in chromosome form during replication for simplicity. Begins as soon as daughter cells are formed. Very critical in order for the cell to be prepared for mitosis or meiosis. Making a second copy of all of the dna that exists within the nucleus of the cell. The copies of the chromosomes are referred to as sister chromatid attached at the. Dna is not in chromosomes form during replication it is in chromatin form which. Dna does not condense into chromosomes until mitosis begins. By the end there are 46 replicated chromosomes which remain attached to the. A second centrosome has to be made in g2 which is what will migrate to the. Spindle fibres also begin to form and these latch onto the chromosomes during.

Related Questions

Determine if the following events occur during Mitosis, Meiosis I, Meiosis II, Mitosis and Meiosis, Mitosis and Meiosis I, or Mitosis and Meiosis II. (Answers may be used once, more than once or not at all. Be as accurate as possible with your answer.)

___ 1. The chromosome number is reduced by half.

___ 2. The amount of DNA in the cell is twice the amount of a normal diploid cell in G1.

___ 3. DNA is replicated during S phase.

___ 4. Homologous chromosomes separate.

___ 5. Sister chromatids separate.

___ 6. Chromosomes condense and align along the metaphase plate.

___ 7. Homologous chromosomes align and undergo crossing over.

___ 8. Has one round of division per round of DNA replication.

___ 9. The number of chromatids is equal to the number of chromosomes of a diploid cell in G1.

___ 10. Tetrads align on the metaphase plate.

a. Mitosis and Meiosis I only

b. Both Mitosis and Meiosis

c. Meiosis II only

d. Mitosis and Meiosis II only

e. Mitosis only

f. Meiosis I only

coppercattle579

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

Match the term with its correct definition or explanation.

Chromatin

Homologous Chromosomes

Sister chromatids

Diploid

Interphase

S Phase

Synapsis

Crossing Over

Cell Plate

Cleavage Furrow

A. The exchange of genetic material between homologous chromosomes during meiosis I.

B. The pairing or tight association of homologous chromosomes in meiosis I. Results in the formation of a tetrad.

C. Non-identical copies of the same chromosome. Present in all diploid cells, even before replication. These chromosomes are the same length and contain genes for the same characteristics, but may have different alleles for each gene. D.

The period of the cell cycle that includes G1, S phase, and G2. E. A structure that develops during cytokinesis in plants.

F. Condensed chromosomes.

G. An invagination that develops during cytokinesis in animal cells.

H. When an organism has two copies of every chromosome (2n).

I. Two identical copies of a chromosome. These are only present after DNA replication.

J. The phase of the cell cycle when DNA is replicated.

BIOSC-116 Lecture Notes - Lecture 7: Microtubule, Centrosome, Interphase

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