Copy of Life Cycles of Sexually Reproducing Organisms .docx

Copy of Life Cycles of Sexually Reproducing Organisms .docx...

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PAGE 1 Instructions: 1. Read through the text and highlight in pink the information you feel is important. 2. Answer the questions at the end of each section. 3. Do not copy and paste answers from the text. Answers must be in your own words. 4. Highlight the answers in the text yellow. Life Cycles of Sexually Reproducing Organisms In sexual reproduction , the genetic material of two individuals is combined to produce genetically diverse offspring that differ from their parents. Fertilization and meiosis alternate in sexual life cycles. What happens between these two events depends upon the organism. The process of meiosis, the division of the contents of the nucleus that divides the chromosomes among gametes, reduces the chromosome number by half, while fertilization, the joining of two haploid gametes, restores the diploid condition. There are three main categories of life cycles in eukaryotic organisms: diploid-dominant, haploid- dominant, and alternation of generations.
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PAGE 2 Sexual reproduction takes many forms in multicellular organisms. However, at some point in each type of life cycle, meiosis produces haploid cells that will fuse with the haploid cell of another organism. The mechanisms of variation (crossover, random assortment of homologous chromosomes, and random fertilization) are present in all versions of sexual reproduction. The fact that nearly every multicellular organism on earth employs sexual reproduction is strong evidence for the benefits of producing offspring with unique gene combinations, although there are other possible benefits as well. 1. How is Fertilization different from Meiosis? Fertilization restores the diploid condition, while Meiosis reduces the chromosome number among gametes by half. 2. What does haploid mean? A cell that contains only one set of chromosomes.
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  • Spring '17
  • Poop Poop
  • Biology, Ploidy, Gamete, Spore, haploid gametes

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