1_Cell Division

• branch of science related to growth, formation, and development of embryo

  embryology
• precursor of gametes

  germ cells
• sperm cells and egg cells are considered

  germ cells
• cells that line seminiferous tubules

  spermatogonium
• spermatogonium are precursors to

  spermatids
• how many spermatocytes do spermatogonium form

  2
• how do germ cells give rise to gametes

  through meiosis
• germ cells are diploid or haploid?

  diploid
• gametes are diploid or haploid?

  haploid
• no. of chromosomes in cats

  38
• no. of chromosomes in dogs

  78
• no. of chromosomes in horse

  64
• no. of chromosomes in cattle

  60
• no. of chromosomes in goat

  60
• no. of chromosomes in humans

  46
• no. of chromosomes in pigs

  38
• cells that mature into sperm cells

  spermatids
• no. of chromosomes in sheep

  58
• cells responsible for taking care of developing sperm cells

  sustentacular/sertoli/nurse cells
• what hormones do sertoli cells bathe sperm cells in

  testosterone
• cells responsible for testosterone production

  leydig cells
• in a sperm cell, where are chromosomes located

  head
• the mitochondria of a sperm cell is found in its

  midpiece
• other term for mitosis

  somatic cell division
• type of cell division producing identical daughter cells with same characteristics

  mitosis
• how many daughter cells does mitosis produce

  2
• stage of division where chromosomal pairs condense and become compact

  prophase
• in prophase, sister chromatids are joined together where?

  centromere
• stage of division characterized by breaking down of nuclear membrane as spindle fibers move to opposite poles

  metaphase/early metaphase/late prophase
• at the end of metaphase, where do fibers align the chromatids

  equatorial plate
• in this stage of division, contracting spindle fibers separate sister chromatids and pull them towards opposite poles of the cell

  anaphase
• identical halves of chromosomes

  chromatids
• division of cytoplasm forming 2 daughter cells

  cytokinesis
• mitosis duplicates genetic material where new daughter cells are identical to parent cells
• in what phase is chromosome DNA earlier duplicated

  s phase
• in prophase, this divides and 2 minute bodies move apart

  centrosome
• in prophase, this appears in the cytoplasm about each centriole

  astral rays
• becomes continuous during prophase

  nucleoplasm, cytoplasm
• disappears during prophase

  nuclear membrane, nucleolus
• threads of the cental/achromatic spindle formed between 2 asters

  amphiaster