Meiosis 99
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Meiosis is the process by which sex cells are formed. It involves two rounds of cell division called Meiosis I and Meiosis II. This results in four daughter cells with half the number of chromosomes as the original parent cell, allowing for genetic variation in offspring. The key events of meiosis include DNA replication, formation of tetrads through homologous chromosome pairing, independent assortment and crossing over of chromosomes, and division of chromatids to form four haploid cells.
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Lab TemplateWeek 4 MeiosisSubmitted by your name here.docx
Lab Template
Week 4: Meiosis
Submitted by: <your name here>
As you complete the lab, record your answers in this template. Save the document as LastName_FirstName_BIO1020_W4A3, and submit it to the Dropbox. Full lab instructions and the rubric with which you will be evaluated can be found in the online classroom.
Activity
Cellular reproduction in Eukaryotes involves either mitosis or, in the case of sex cells, meiosis. Mitosis involves the reproduction of a cell into two identical daughter cells. Meiosis, however, is a reduction division where a parental diploid cell produces four haploid gametes. Upon fusion, two haploid gametes (in humans the sperm and the egg) will result in one diploid zygote. In this activity you will track chromosomes through meiosis using colored beads.
Experiment 1
Questions
1. Why is crossing over important in heredity? (10 points)
2. Provide two ways that meiosis I and meiosis II are different. (10 points)
3. (10 points)
a. In the lab, how many chromosomes were present in each cell when meiosis I started?
b. How many chromosomes were present in each daughter cell at the end of meiosis II?
4. If humans have 46 chromosomes in each of their body cells, determine how many chromosomes you would expect to find in the following (10 points):
Sperm:
Egg:
Daughter cell from mitosis:
Daughter cell from meiosis II:
5. Why is it necessary to reduce the chromosome number of gametes, but not of other cells of an organism? (10 points)
41
Meiosis
Lab 4
42
Lab 4: Meiosis
43
Introduc on
Meiosis only occurs in organisms that reproduce sexually. The process generates haploid (1n) cells
called gametes (sperm cells in males and egg cells in fe-
males), or spores in some plants, fungi, and pro sts, that
contain one complete set of chromosomes. Haploid cells
fuse together during fer liza on to form a diploid cell with
two copies of each chromosome (2n).
Genes are the units of heredity that have speciÞc loci
(loca ons) on the DNA strand and code for inheritable
traits (such as hair color). Alleles are alterna ve forms of the same gene (brown vs. blue eyes). Homol-
ogous chromosomes contain the same genes as each other but o en di erent alleles. Non-sex cells
(e.g. bone, heart, skin, liver) contain two alleles (2n), one from the sperm and the other from the egg.
Mitosis and meiosis are similar in many ways. Meiosis, however, has two rounds of division—meiosis I
and meiosis II. There is no replica on of the DNA between meiosis I and II. Thus in meiosis, the parent
cell produces four daughter cells, each with just a single set of chromosomes (1n).
Meiosis I is the reduc on division– the homologous pairs of chromosomes are separated so that each
daughter cell will receive just one set of chromosomes. During meiosis II, sister chroma ds are sepa-
rated (as in mitosis).
Concepts to explore:
Meiosis
Diploid cells
Haploid cells
...
Cell Division--- Meiosis---Tarini..pptx
XI Biology - Topic Cell division-Meiosis,
Notes for NEET,CET.
It includes detailed description of meiosis with images.
1. Of the following, which is a difference between prokaryotic and e.pdf
1. Of the following, which is a difference between prokaryotic and eukaryotic cells?
A. Eukaryotic cells have a nuclear envelope surrounding the genetic material, whereas
prokaryotes have no nucleus.
B. Prokaryotic cells have multiple paired chromosomes, but eukaryotic cells have
only one.
C. Prokaryotic cells have linear DNA, whereas eukaryotes have circular DNA.
D. Eukaryotes have histone proteins, whereas prokaryotes do not.
E. Plasmids contain some genes for eukaryotes, whereas organelles contain some
genes for prokaryotes.
2. Which of the following are fundamental events that must take place in cell reproduction?
A. A cell\'s genetic information must be copied.
B. The copies of the genetic information must be separated from one another.
C. The cell must divide.
D. All of the above are fundamental events that must take place in cell
reproduction.
3. What are three essential structural elements of a functional eukaryotic chromosome?
A. Histone proteins, spindle fibers, and a pair of telomeres
B. Origins of replication, chromatids, and kinetochores
C. A centromere, a pair of telomeres, and origins of replication
D. A centromere, chromatids, and kinetochores
E. Spindle fibers, kinetochores, and chromatids
4. The chromosomal structures that serve as the attachment point for spindle fibers are the
_____________________.
A. telomeres
B. origins of replication
C. centromeres
D. kinetochore proteins
E. histone proteins
5. The natural ends of eukaryotic chromosomes that serve to stabilize the ends of the
chromosomes are the ______________________.
A. telomeres
B. origins of replication
C. centromeres
D. kinetochore proteins
E. histone proteins
6. _______________ is the part of interphase within the cell cycle where the cell growth and
protein synthesis necessary for cell division and DNA replication take place.
A. G1
B. S
C. G2
D. M
E. Telophase
7. __________________ is the part of interphase within the cell cycle where additional
biochemical reactions take place preparing the cell for mitosis.
A. G1
B. S
C. G2
D. M
E. Telophase
8. __________________ is the part of interphase within the cell cycle where DNA replication
takes place.
A. G1
B. S
C. G2
D. M
E. Telophase
9. What are checkpoints?
A. Key transition points in the cell cycle that lead to cancer
B. Periods during the cell cycle that ensure all cellular components are in good
working order
C. Transition points during the process of replication that allow DNA repair
D. The last process that occurs before a cell divides
E. Critical points that ensure correct and complete cytokinesis
10. What is the stage in mitosis when sister chromatids separate at the centromere and move to
opposite poles of the cell.
A. Prophase
B. Prometaphase
C. Metaphase
D. Anaphase
E. Telophase
11. What is the stage of mitosis where the chromosomes are arranged on the equatorial plane of
the cell.
A. prophase
B. prometaphase
C. metaphase
D. anaphase
E. telophase
12. What is the stage of mitosis where the chromosomes ini.
Chapter 4 Section 2 Notes
Sexual Reproduction and Meiosis
Unit 1
Chapter 4: Cell Reproduction
Section 2: Sexual Reproduction and Meiosis
Chapter 2 problems.1. (Problem 1) Of the following, whi.pdf
Chapter 2 problems.
1. (Problem 1) Of the following, which is a difference between prokaryotic and eukaryotic
cells?
A. Eukaryotic cells have a nuclear envelope surrounding the genetic material, whereas
prokaryotes have no nucleus.
B. Prokaryotic cells have multiple paired chromosomes, but eukaryotic cells have only
one.
C. Prokaryotic cells have linear DNA, whereas eukaryotes have circular DNA.
D. Eukaryotes have histone proteins, whereas prokaryotes do not.
E. Plasmids contain some genes for eukaryotes, whereas organelles contain some
genes for prokaryotes.
2. (Problem 3) Which of the following are fundamental events that must take place in cell
reproduction?
A. A cell\'s genetic information must be copied.
B. The copies of the genetic information must be separated from one another.
C. The cell must divide.
D. All of the above are fundamental events that must take place in cell reproduction.
3. (Problem 4 part 1): What are three essential structural elements of a functional
eukaryotic chromosome?
A. Histone proteins, spindle fibers, and a pair of telomeres
B. Origins of replication, chromatids, and kinetochores
C. A centromere, a pair of telomeres, and origins of replication
D. A centromere, chromatids, and kinetochores
E. Spindle fibers, kinetochores, and chromatids
4. (Problem 4 part 2 ) The chromosomal structures that serve as the attachment point for
spindle fibers are the _____________________.
A. telomeres
B. origins of replication
C. centromeres
D. kinetochore proteins
E. histone proteins
5. (Problem 4 part 3) The natural ends of eukaryotic chromosomes that serve to stabilize
the ends of the chromosomes are the ______________________.
A. telomeres
B. origins of replication
C. centromeres
D. kinetochore proteins
E. histone proteins
6. (Problem 6, part 1) _______________ is the part of interphase within the cell cycle
where the cell growth and protein synthesis necessary for cell division and DNA replication take
place.
A. G1
B. S
C. G2
D. M
E. Telophase
15. (Problem 10) Why are the two cells produced by the cell cycle genetically identical?
A. An exact copy of each DNA molecule was created in S phase giving rise to the two
identical sister chromatids.
B. Chromosomal replication in prophase ensures two identical copies of each
chromosome for the two cells.
C. Mitosis ensures that each cell receives one copy of the two identical sister
chromatids created during S phase.
D. Both A and B are reasons that the two cells produced by the cell cycle are identical.
E. Both A and C are reasons that the two cells produced by the cell cycle are identical.
16. (Problem 11, part 1) For the stages of meiosis I below, which is incorrectly matched to a
major event that takes place during that stage?
A. Prophase I—synapsis
B. Metaphase I—homologous pairs of chromosomes line up on the equatorial plane of
the metaphase plate
C. Anaphase I—separation of sister chromatids
D. Telophase I—separated chromosomes reach spindle poles at opposite ends of the
cell
.
Meiosis and its different stages
The slides contain all about meiosis. in this slides i collected all information about meiosis. which is useful for everyone.
so watch these slides and comment for any problems.
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- 1. Meiosis- The Formation of Sex Cells