2.3 Meiosis This process is more complicated than what occurs in mitosis. In meiosis, the genetic complement is cut in half so that the daughter cells each have half the number of chromosomes as the original cell. Because of this, meiosis is often called a reduction division. The genetic complement is now half the original, meaning one copy of each chromosome pair ends up in each daughter cell. This is the haploid number. This process produces the gametes, the sperm, and the ovum, and it takes place in the testes and ovaries, respectively. Two divisions, meiosis I and meiosis II, make this possible. Prior to meiosis, the chromosomes replicate themselves, again becoming double stranded. Thus, there are 46 double-stranded chromosomes when meiosis I begins. During meiosis I, the homologous chromosomes pair with each other, join together, and intertwine. The homologous chromosome pairs separate, with one homologue moving into one daughter cell, while the other homologue moves into the second daughter cell. The end result of meiosis I is two daughter cells with 23 double-stranded chromosomes each. In meiosis II, each daughter cell now divides, resulting in four daughter cells total. In the nucleus, the sister chromatids separate, with one strand going into each daughter cell. The result is four daughter cells, each with half the number of original chromosomes (23). In males, this process is referred to as spermatogenesis and produces four sperm cells. In females, this process is called oogenesis and produces one egg cell and three polar bodies; the polar bodies later disintegrate. When an egg and sperm combine, the resulting zygote has one set of 23 chromosomes from the mother and one set of 23 chromosomes from the father. EXERCISE 2: Mitosis and Meiosis Compare and contrast mitosis and meiosis in the human with the following matching questions. produces somatic cells produces 4 daughter cells as final product begins with 46 chromosomes produces 2 daughter cells as final product one cell division one chromosome replication produces gametes daughter cells have 23 chromosomes each two cell divisions daughter cells are diploid A. mitosis B. meiosis C. both mitosis and meiosis

Human Anatomy & Physiology (11th Edition)
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2.3 Meiosis
This process is more complicated than what occurs in mitosis. In meiosis, the genetic
complement is cut in half so that the daughter cells each have half the number of chromosomes
as the original cell. Because of this, meiosis is often called a reduction division. The genetic
complement is now half the original, meaning one copy of each chromosome pair ends up in
each daughter cell. This is the haploid number. This process produces the gametes, the sperm,
and the ovum, and it takes place in the testes and ovaries, respectively. Two divisions, meiosis I
and meiosis II, make this possible.
Prior to meiosis, the chromosomes replicate themselves, again becoming double stranded. Thus,
there are 46 double-stranded chromosomes when meiosis I begins. During meiosis I, the
homologous chromosomes pair with each other, join together, and intertwine. The homologous
chromosome pairs separate, with one homologue moving into one daughter cell, while the other
homologue moves into the second daughter cell. The end result of meiosis I is two daughter cells
with 23 double-stranded chromosomes each. In meiosis II, each daughter cell now divides,
resulting in four daughter cells total. In the nucleus, the sister chromatids separate, with one
strand going into each daughter cell. The result is four daughter cells, each with half the number
of original chromosomes (23). In males, this process is referred to as spermatogenesis and
produces four sperm cells. In females, this process is called oogenesis and produces one egg cell
and three polar bodies; the polar bodies later disintegrate. When an egg and sperm combine, the
resulting zygote has one set of 23 chromosomes from the mother and one set of 23 chromosomes
from the father.
EXERCISE 2: Mitosis and Meiosis
Compare and contrast mitosis and meiosis in the human with the following matching questions.
produces somatic cells
produces 4 daughter cells as final product
begins with 46 chromosomes
produces 2 daughter cells as final product
one cell division
one chromosome replication
produces gametes
daughter cells have 23 chromosomes each
two cell divisions
daughter cells are diploid
A. mitosis
B. meiosis
C. both mitosis and meiosis
Transcribed Image Text:2.3 Meiosis This process is more complicated than what occurs in mitosis. In meiosis, the genetic complement is cut in half so that the daughter cells each have half the number of chromosomes as the original cell. Because of this, meiosis is often called a reduction division. The genetic complement is now half the original, meaning one copy of each chromosome pair ends up in each daughter cell. This is the haploid number. This process produces the gametes, the sperm, and the ovum, and it takes place in the testes and ovaries, respectively. Two divisions, meiosis I and meiosis II, make this possible. Prior to meiosis, the chromosomes replicate themselves, again becoming double stranded. Thus, there are 46 double-stranded chromosomes when meiosis I begins. During meiosis I, the homologous chromosomes pair with each other, join together, and intertwine. The homologous chromosome pairs separate, with one homologue moving into one daughter cell, while the other homologue moves into the second daughter cell. The end result of meiosis I is two daughter cells with 23 double-stranded chromosomes each. In meiosis II, each daughter cell now divides, resulting in four daughter cells total. In the nucleus, the sister chromatids separate, with one strand going into each daughter cell. The result is four daughter cells, each with half the number of original chromosomes (23). In males, this process is referred to as spermatogenesis and produces four sperm cells. In females, this process is called oogenesis and produces one egg cell and three polar bodies; the polar bodies later disintegrate. When an egg and sperm combine, the resulting zygote has one set of 23 chromosomes from the mother and one set of 23 chromosomes from the father. EXERCISE 2: Mitosis and Meiosis Compare and contrast mitosis and meiosis in the human with the following matching questions. produces somatic cells produces 4 daughter cells as final product begins with 46 chromosomes produces 2 daughter cells as final product one cell division one chromosome replication produces gametes daughter cells have 23 chromosomes each two cell divisions daughter cells are diploid A. mitosis B. meiosis C. both mitosis and meiosis
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