BISC 1111 Chapter Notes - Chapter 12.1-12.2: Spindle Apparatus, Sister Chromatids, G2 Phase

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8 Feb 2017

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Cell division is a integral part of the cell cycle, the life of a cell from the time it is first formed during division of a parent cell until its own division into two daughter cells. In both prokaryotes and eukaryotes, most cell division involves the distribution of identical genetic material to two daughter cells: exception is meiosis, which produces sperm and eggs. Dna molecules are packaged into structures called chromosomes so that the dna can be copied or replicated easily. Chromatin- the entire complex of dna and proteins that is the building material of chromosomes. Each somatic human cell contains 46 chromosomes, made up of two sets of 23, one set inherited from each parent: somatic cells- all body cells except reproductive cells which produce gametes- sperm and eggs. Each gamete has one set of 23 chromosomes. Each duplicated chromosome has two sister chromatids, which are joined copies of the original chromosome.

Related Questions

Match the terms to the definitions provided.

Question 1 options:

	gamete
	somatic cells
	zygote
	sexual reproduction

1.	Reproductive life cycle that involves an alternation between haploid and diploid cells
2.	A single cell with a diploid number of chromosomes resulting from the fusion of an egg and a sperm.
3.	Cells (egg or sperm) resulting from a meiotic division of germ-line cells
4.	The non-reproductive cells found in embryos and mature individuals

Question 2 (5 points)

Match the terms to the definitions provided.

Question 2 options:

	syngamy
	haploid
	meiosis
	diploid
	germ-line cells

1.	The cells that will eventually undergo meiosis to produce gametes.
2.	The number of chromosomes found in gametes (eggs or sperm).
3.	The process by which two haploid gametes fuse to form a new diploid cell.
4.	A specialized reduction division that produces cells with half the normal number of chromosomes.
5.	Two sets of chromosomes present in the somatic cells of adult individuals.

M2A1 Worksheet: Mitosis and Meiosis

A dog is a diploid organisms and has 39 pairs of chromosomes (2n = 78), where n = 39 chromosomes from each parent. Use this example to answer the following question regarding chromosomal number.

INTERPHASE

How many chromosomes are present in the somatic cell?

What do they look like?

What are they âdoingâ in G1 of this phase?

What is happening in the S phase?

What is happening in the G2 phase?

What follows G2 phase in a somatic cell?

What follows G2 phase in a gamete cell?

MITOSIS

Number of chromosomes in the parent cell.

Number of chromatids in the parent cell.

Number of chromosomes in the daughter cell.

Number of chromatids in the daughter cell.

How many daughter cells are produced?

Are the daughter cells haploid or diploid?

How many cell divisions take place?

In what type of cell does this division occur?

Meiosis 1:

Number of chromosomes in the parent cell.

Number of chromatids in the parent cell.

Number of chromosomes in each Meiosis I daughter cell.

Number of chromatids in each Meiosis I daughter cell.

Are the daughter cells haploid or diploid at the end of Meiosis 1?

Meiosis II:

Number of chromosomes in the âparentâ cell (which is a daughter cell from Meiosis I).

Number of chromatids in the âparentâ cell.

Number of chromosomes in each Meiosis II daughter cell.

Number of chromatids in each Meiosis II daughter cell.

Are the daughter cells haploid or diploid at the end of Meiosis II?

Which phase or phases of Meiosis account for the genetic variability among the daughter cells? Howâ¦ what happens in this phase to create the diversity?

Comparing Mitosis and Meiosisâ¦..

How many daughter cells result from Mitosis? Are they diploid or haploid?

How many daughter cells result from Meiosis? Are they diploid or Haploid?

Cell structures and function: Match each organelle to its function:

Organelle Function

Lysosome 1. Lipid synthesis

Rough ER 2. Houses DNA

Nucleus 3. Energy extraction

Smooth ER 4. Dismantles debris

Golgi apparatus 5. detoxification

Mitochondria 6. Protein synthesis

Peroxisome 7. Processes secretions

What is the function of checkpoint proteins in the cell cycle?

How can all of a personâs cells contain exactly the same genetic material, yet specialize as bone cells, nerve cells, muscle cells and connective tissues?

What are the 3 primary germ layers?

Briefly, in one or two sentences, distinguish between

a bacterial cell and a eukaryotic cell

interphase and mitosis

mitosis and apoptosis

an autosome and a sex chromosome

homologous pair of chromosomes and a sister chromatid

centromere and centriole

chromosome and chromatid

monozygotic and dizygotic twins

allele and gene

Question 1: For each of the following terms, select the best definition:

gene, phenotype, chromosome, genotype, allele, genome

2.DNA that provides the instructions for synthesizing various types of small RNA molecules1.The complete set of genetic material in a cellan observable trait (or traits) of an organism

3.DNA that provides instructions for building a proteina variant of a gene

4.DNA of no known function

5.The genetic composition that underlies a trait (or traits)

6.A single molecule of DNA & its associated "helper" molecules

7.The portion of DNA that controls when and where proteins are synthesized

Question 2: Fill in the blank with these terms: dependent variable, independent variable, y-axis, x-axis

Understanding graphs is an important skill in science, since being able to visually depict data is often useful for identifying patterns, and can sometimes be the only tool for easily evaluating whether or not the data supports your hypothesis. When viewing a graph, the______ is plotted on the______, and the______we are measuring is plotted on the_____. For example, in one of the photosynthesis experiments last week, temperature was the______, while the size of the bubble at the end of the experiment was the_____

Question 3: For each of the following terms, select the best definition:

diploid cell, haploid cell, fertilization, zygote, gamete, somatic cell

1. The merging of two gametes

2. Any cell in an organism, except those used for reproduction

3. A cell with only one copy of each gene

4. The process of cell division

5. The cells used for sexual reproduction (generally eggs & sperm)

6. The initial cell of an organism

7. A cell that is capable of differentiating into multiple types of specialized cells

8. A cell with two copies of each gene

BISC 1111 Chapter Notes - Chapter 12.1-12.2: Spindle Apparatus, Sister Chromatids, G2 Phase

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