BIO-0013 Lecture : 13.1, 13.2 Class Notes.docx

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byzantiumswan850

29 Mar 2014

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Interphase: chromosomes replicate in parent cell; uncondensed chromosomes: early prophase i: chromosomes condense; nuclear envelope breaks up; spindle apparatus forms; synapsis (pairing) of homologous chromosomes, homologous chromosomes line up next to each other (instead of along one plane in mitosis) (cid:224) allows for crossing over, tetrad = 4 chromatids from homologous chromosomes, late prophase i: crossing over of non sister chromatids (often multiple crossovers between the same chromatids, crossing over occurs between homologous chromosomes. Synaptonemal complex is destroyed after crossing over: metaphase i: tetrads migrate to the metaphase plate, anaphase i: homologs separate and begin moving to opposite sides of the cell, telophase i and cytokinesis: chromosomes move to opposite sides of the cell, which then divides, prophase ii: spindle apparatus forms, metaphase ii: chromosomes line up at middle of cell (metaphase plate, anaphase ii: sister chromatids separate, begin moving to opposite sides of cell, telophase ii and cytokinesis: chromosomes move to opposite sides of cell, then cell divides.

Related Questions

Determine whether the following applies to mitosis, meiosis, orboth; also identify the specific stage of cell division thatapplies (e.g. mitosis prophase, meiosis anaphase II, etc)

1) chromosomes pairs line up across the center of the cell

2) sister chromatids seperate

3) spindle fibers separate homologous chromosomes

4) 4 haploid daughter cells are produced

5) a cell 1st undergoes DNA replication

6) chromosomes line up single file across the middle of thecell

7) sister chromatids separate from each other

8) 2 haploid daughter cells form

9) the nuclear membrane re forms

10) spindle fibers attach to pairs of homologous chromosomes

11) the nuclear membrane begins to dissolve

12) centrosomes duplicate

13) synapsis and crossing over occurs

14) 2 diploid daughter cells form

turquoiseporpoise808

10. Make a simplified diagrammeiosis starting with a cell containing3 pairs ofchromosomes.

Include and Label: Each stageof meiosis I & II and indicate if a cell is haploid (n) ordiploid (2n); plasma membrane, nuclear envelope, sisterchromatids,separation of sister chromatids, spindle fibers/microtubules,tetrad, homologous chromosomes, separation of homologouschromosomes, cleavage furrow.

What happens to the DNA during the interphase inpreparation for meiosis?

What happens to the DNA during the interphase betweenmeiosis I and II?

How do the daughter cells compare genetically to theparent cell after....

a) meiosis I?

b) meiosis II?

What is the diploid number for the species diagrammedabove? 2n =

What is the haploid number? n=

crimsonhamster738

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.

BIO-0013 Lecture : 13.1, 13.2 Class Notes.docx

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