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Sperm cells


Sperm cells are little more than flagellated nuclei. Each consists of
a head, which has
an acrosome at its tip and
contains a haploid set of chromosomes in a compact, inactive, state.
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sperm cells: haploid cells within the male testes.
S phase: the phase within the cell division cycle in which DNA is replicated.
spinal cord: the white cord of tissue passing through the bony tunnel made by the vertebrae.
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In sperm cells of many higher animals, the acrosome develops over the anterior half of its head. It is a cap-like structure derived from the Golgi apparatus. In Eutherian mammals, acrosome formation is completed during testicular maturation.
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~ 10-100 µm (sperm cells, apart from the tail, are smaller)
Type of nucleus
nucleoid region; no real nucleus ...
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At about the same time, it was also discovered that during the formation of egg and sperm cells, a cell division occurs without prior doubling of the number of chromosomes.
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Spermatogenesis is the process of forming sperm cells by meiosis (in animals, by mitosis in plants) in specialized organs known as gonads (in males these are termed testes). After division the cells undergo differentiation to become sperm cells.
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meiosis Process of cell division by which egg and sperm cells are formed, involving a diminution in the amount of genetic material.
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A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells of animals and in the egg and pollen cells of plants (Gk. haploos, single). Human beings have 23 chromosomes in their reproductive cells.
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gametes
Haploid egg or sperm cells that unite during sexual reproduction to produce a diploid zygote.
Covered in:
Lab 5 Sexual Reproduciton and Meiosis
Lab 14 Gametogenesis and Development ...
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antheridium -- The organ on a gametophyte plant which produces the sperm cells.
anthophyte -- A flowering plant, or any of its closest relatives, such as the Bennettitales, Gnetales, or Pentoxylales.
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Haploid: A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells o f animals and in the egg and pollen cells of plants. Human beings have 23 chromosomes in their sex cells. Compare to diploid.
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A mechanism of fertilization in angiosperms, in which two sperm cells unite with two cells in the embryo sac to form the zygote and endosperm.
double helix ...
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Is somatic gene therapy (which is done in the adult cells of persons known to have the disease) more or less ethical than germline gene therapy (which is done in egg and sperm cells and prevents the trait from being passed on to further generations)?
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Haploid: A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells of animals and in the egg and pollen cells of plants. Human beings have 23 chromosomes in their reproductive cells. Compare diploid.
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a single cell produces four daughter cells each of which contains half of the number of chromosomes of the parent cell. For example, a single diploid spermatogonium (primordial germ cell) will divide meiotically to produce 4 haploid sperm cells.
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is silenced during gamete formation in the egg (when maternal gene copies are silenced) or the sperm (when paternal gene copies are silenced). This is known as genetic imprinting. Imprinting occurs in each generation when new egg and sperm cells are ...
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