life science grade7 chpt 4 reproduction

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Anonymous
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131402
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life science grade7 chpt 4 reproduction
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2012-01-29 19:16:23
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reproduction
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grade 7 life science reproduction
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  1. sexual reproduction
    a type of reproduction in which the genetic materials from two different cells combine, producing an offspring.
  2. where do sex cells form?
    reproductive organs
  3. egg
    the female sex cell

    forms in the ovary
  4. sperm
    the male sex cell

    forms in the testis
  5. fertilization
    process in which an egg cell and sperm cell join together.

    produces a new cell (zygote)
  6. zygote
    the new celll that forms from fertilization
  7. following fertilization, what processes does the zygote go through?
    mitosis and cell division
  8. organisms that reproduce sexually form what two kinds of cells?
    body cells (similar chromosomes occur in pairs)

    sex cells
  9. diploid cells
    `cells that have pairs of chromosomes
  10. homologous chromosomes
    pairs of chomosomes that have genes for the same traits arranged in the same order.
  11. why aren't chromosomes identical?
    because one chromosome is inherited from each parent
  12. different organisms have different numbers of chromosomes. Why is having the correct number of chromosomes important?
    if a zygote has too many or too few chromosomes it will not develop properly
  13. haplioid cell
    cells that have only one chromosome from each pair
  14. how do diploid cells differ from haploid cells?
    In a "diploid" cell, there are two copies of each chromosome In a "haploid" cell, there's only one copy of each chromosome.

    Most of your body's cells are diploid. Only the gametes, the sperm (in men) and the eggs (in women) are haploid

    Diploid cells reproduce by mitosis

    Haploid cells are a result of the process of meiosis
  15. What process do organisms use to produce sex cells?
    meiosis
  16. Meiosis
    one diploid cell divides and makes four haploid sex cells

    meiosis occurs only during the formation of sex cells
  17. what happens to a reproductive cell before beginning meiosis I?
    • interphase:
    • cell grows and duplicates chromosomes
  18. what are the phases of meiosis I?
    prophase I

    metaphase I

    anaphase I

    telophase I
  19. prophase I
    duplicated chromosomes condense

    homologous chromosomes form pairs

    membrane around nucleus breaks apart

    nucleolus disappears
  20. metaphase I
    homologous chromosome pairs line up in middle of cell

    spindle fiber attaches to each chromosome
  21. anaphase I
    chromosome pairs separate and are pulled toward opposite ends of cell

    (sister chromatids stay together)
  22. telophase I
    nuclear membrane forms around each group of duplicated chromosomes

    cytoplasm divides through cytokinesis, making two daughter cells

    sister chromatids remain together

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