Meiosis and life cycles

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Author:
efrain12
ID:
145338
Filename:
Meiosis and life cycles
Updated:
2012-04-02 19:37:21
Tags:
botany
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meisosi
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  1. Why is sexual reproduction important? (3)
    -combines gametes from both parents

    -results in mature of genes

    -allows plants to adapt to changes
  2. What makes up sexual reproduction? (2)
    -fertilization (Oogamy)

    -meiosis
  3. (makes up for fertilization) Fertilization
    -fission of gametes, sex cells

    -fission of egg and sperm
  4. (makes up for fertilization) Meiosis
    -reduces # of chromosomes in half

    -prevents doubling of chromosomes and chromosome number

    -forms gametes (egg and sperm)
  5. What is the chromosome #?
    -chromosome number > N or n

    • *basic # of chromosomes after meiosis
    • *unique for each organism
  6. Meiosis ________ the chromosomes #
    halves
  7. Fertilization __________ the chromosome #
    doubles
  8. Life cycles
    shows place of meiosis and fertilization
  9. 1N or Haploid
    one of each pair of chromosomes

    -1N or n


    *gametophyte generation
  10. 2n or diploid
    -both pair of chromosomes

    -2n

    *sporophyte generation
  11. After meiosis _________
    1N
  12. After fertilization ________
    2n
  13. Gametophyte generation
    -1N or haploid

    -formed after meiosis

    • ex) spore, gametophyte, egg and sperm, gametes
    • *gametophyte plant
  14. Sporophyte generation
    -2n or diploid

    -formed after fertilization

    ex) zygote, embryo, sporangium

    *sporophyte plant

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