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Meiosis and Sexual Reproduction: Key Concepts in Genetic Variation

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evelia
20 diapositives · 349 Views · Oct 15, 2014

Chapter 11 delves into meoisis and its crucial role in sexual reproduction, highlighting the mechanisms that contribute to genetic variation such as random fertilization, independent assortment, and crossing over. It contrasts meiosis with asexual reproduction, emphasizing how genetic variability is essential for adaptation. The chapter discusses haploid and diploid cells, gamete formation through spermatogenesis and oogenesis, and the life cycle of organisms. Understanding these processes is fundamental to grasping the complexities of heredity and evolution.

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  1. Chapter 11 Review Meiosis and Sexual Reproduction

  2. Meiosis • Occurs in all sexually reproducing organisms

  3. Genetic Variation • Contributes to genetic variation: • Random fertilization • Independent assortment • Crossing over • Binary Fission does not lead to genetic variations.

  4. Haploid - Diploid • In the alternation of generations, spores, gametophytes and egg and sperm are Haploid • Sporophytes are Diploid

  5. Meiosis • Two successive divisions are responsible for the formation of four haploid cells.

  6. Asexual Reproduction • DNA does not vary much between offspring • Many offspring are produced in a short time • Organisms may not be able to adapt to new environments

  7. Fragmentation • Is a form of asexual reproduction

  8. Gametes • In humans, each gamete receives one chromosome from each of 23 pairs

  9. Crossing Over • Portions of a chromatid on one homologous chromosome break off and trade places with the corresponding portion on one of the chromatids of the other homologous chromosome

  10. Life Cycle • The activities in the life of an organism from one generation to the next.

  11. Diploid • A cell that contains two sets of chromosomes

  12. Independent Assortment • Random distribution of homologous chromosomes during meiosis

  13. Homologous Chromosomes • Chromosomes that are similar in shape and size and have similar gentetic information

  14. Spermatogenesis • The process by which gametes are produced in male animals

  15. Haploid • A cell that contains one set of chromosomes

  16. Oogenesis • The process by which gametes are produced in female animals

  17. Fertilization • The union of sperm and egg cells to produce a diploid zygote

  18. Asexual Reproduction • All copies of the single parent’s genes are passed to the offspring

  19. Ovum • Female gamete, also called an egg

  20. Test Chapter 11 • Tomorrow