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Need-to-know Vocabulary Homologous Chromosomes Replicated Chromosome Centromere Kinetocore Sister Chromatid Tetrad
Like in the Interphase of mitosis, meiosis starts with the splitting of the centriole and the duplication of DNA
Now, the Chromatin coils into chromosomes and pair up with their homologous match. The centrioles move to the poles as the nuclear membrane and the nucleolus disappear
The homologous pairs move to the equator, and the centrioles attach spindle fibers to the kinetocore of the nearest chromosome.
Before metaphase I, homologous chromosomes will exchange pieces of DNA which is known as “crossing over” This process officially happens while in Prophase I.
The polar fibers retract, separating the homologous pairs.
The cell splits in two, each with one centriole and one set of replicated chromosomes. The spindle fibers will disappear.
Note: Many illustrations skip Interphase 2, because it’s considered unnecessary, and usually jump straight to Prophase 2 with the understanding that centrioles replicated.
The centrioles duplicate themselves again and move to the equator
The replicated chromo- somes move to the equator. The centrioles throw out their spindle fibers to attach to the kinetochores.
The polar fibers retract and separate the sister chromatids.
The spindle fibers disappear The chromosomes gather as the nuclear membrane and the nucleolus re-appear
Both cells divide, creating 4 separate haploid cells
Finally, the chromosomes uncoil into chromatin, completing meiosis
The Process of Cell Division Tetrad Centromere Kinetocore Sister Chromatid Chromosome Homologous Chromosome.
11-4 Meiosis Pg A. Purpose of Meiosis 1. Make reproductive cells (sex cells). 2. Reduces chromosome # in half.
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Lesson 9.3: Meiosis: The Life Cycle of Sex Cells Goals: Identify male and female gametes Compare chromosome numbers between somatic cells and gametes.
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MEIOSIS Making gametes for reproduction. Meiosis Type of cell division where ONE body cell produces FOUR gametes –Each gamete* contains half the number.
Reduction of Chromosomes. Mitosis Cell duplication (or reproduction) where one cell creates two genetically identical daughter cells Cellular reproduction,
Quick Review 1.What terms are used to describe cells containing the normal number of chromosomes? 2.What terms are used to describe cells containing half.
Mitosis and Meiosis Higher Biology Mitosis and Meiosis Mitosis: -division of somatic (body) cells Meiosis -division of gametes (reproductive cells)
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What do they do? Stages What’s Going on? What is It?
MEIOSIS Chapter Meiosis This kind of cell division produces gametes containing half the number of chromosomes as a parent’s body cell Meiosis.
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Meiosis occurs in what type of cells? Reproductive cells (the ones that divide to form sperm and eggs) What is “reduction division?” -Cell division that.
Meiosis Sex cell reproduction... Meiosis The process of reproduction division in which the number of chromosomes per cell is cut in half through the separation.
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Mitosis (Cell Division) MITOSIS. Vocab 1.Cell Cycle: the life cycle of a eukaryotic cell, consisting of growth and division 2.Chromatin: uncoiled DNA.
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Meiosis. Meiosis is the type of division which: 1. Reduces the chromosome # from diploid to haploid 2. Is used to produce gametes: eggs and sperm.
Meiosis What is Meiosis? A division of the nucleus that reduces chromosome number by half. Important in sexual reproduction Involves combining the genetic.
Meiosis. Meiosis is a special type of cell division that occurs only in reproductive organs. Meiosis makes reproductive cells called gametes (egg or.
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Cells divide during mitosis and cytokinesis. Cells that make up the “body” of an organism 2.
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Cell Reproduction Chapters 9 & 11. Types of Reproduction Mitosis Asexual – only 1 parent needed & the offspring are identical to the parent cell. Meiosis.
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Meiosis Sex cell (gamete) division= egg and sperm Sex cell (gamete) division= egg and sperm Products= 4 cells all haploid, genetically different Products=
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