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Meiosis is a type of cellular reproduction that enables organisms to produce haploid gametes through two divisions. the stages of meiosis, including prophase 1, metaphase 1, anaphase 1, telophase 1, prophase 2, metaphase 2, anaphase 2, and telophase 2. During meiosis, homologous chromosomes pair, cross-over, and separate, resulting in four haploid daughter cells. This process is crucial for sexual reproduction.
Typology: Lecture notes
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Phases of Meiosis
A cell undergoing meiosis will divide two times; the first division is
meiosis 1 and the second is meiosis 2. The phases have the same
names as those of mitosis. A number indicates the division number
(1st or 2nd):
meiosis 1: prophase 1, metaphase 1, anaphase 1, and telophase 1
meiosis 2: prophase 2, metaphase 2, anaphase 2, and telophase 2
In the first meiotic division, the number of cells is doubled but the
number of chromosomes is not. This results in 1/2 as many
chromosomes per cell.
The second meiotic division is like mitosis; the number of
chromosomes does not get reduced
Meiosis Mitosis
Definition:
A type of cellular reproduction in which the number of chromosomes are reduced by half through the separation of homologous chromosomes, producing two haploid cells.
A process of asexual reproduction in which the cell divides in two producing a replica, with an equal number of chromosomes in each resulting diploid cell.
Function: sexual reproduction
Cellular Reproduction & general growth and repair of the body
Type of Reproduction: Sexual Asexual
Occurs in: Humans, animals, plants, fungi
all organisms
Genetically: different identical
Crossing Over:
Yes, mixing of chromosomes can occur.
No, crossing over cannot occur.
Pairing of Homologs: Yes No
Number of Divisions: 2 1
Number of Daughter Cells produced:
4 haploid cells 2 diploid cells
Chromosome Number: Reduced by half Remains the same
