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Unformatted text preview: OUTLINES FOR BIOLOGY 1201 Section 001 Summer 2008 DR. STEVEN POMARICO Outline 4A CHAPTER 13 MEIOSIS AND SEXUAL LIFE CYCLES Reproduction is an emergent property associated with life. The reproduction of an organism is a consequence of heredity.--- Heredity-Results from the transmission of genes.-When individuals share similar genes (e.g., offspring, siblings, etc.) they often resemble each other.--- Variation-While offspring resemble their parents and siblings there are still some differences.-Some of these similarities and differences are studied using genetics .--- Genetics >>>>>>Offspring acquire genes from parents by inheriting chromosomes--- Genes-specific sequences of nucleotides containing genetic information -most genes code for proteins-each chromosome contains hundreds or thousands of genes.-each gene is in a specific region or locus--- Locus Sexual Reproduction and the Role of Meiosis - 13.1.1 >>>>>>A Comparison of asexual and sexual reproduction--- Asexual reproduction--- Sexual reproduction ASEXUAL REPRODUCTION SEXUAL REPRODUCTION Only one parent Two parents give rise to offspring Single parent passes on all its genes Each parent passes on half its genes Results in a genetically identical offspring or clone Offspring have a unique combination of genes inherited from both parents. Rare genetic differences in offspring are the result of DNA changes, or mutations Greater genetic variation with offspring being genetically different from their parents and siblings--- Clone--- Mutation >>>>> Fertilization and meiosis alternate in sexual life cycles. The human life cycle follows the basic pattern shared by all sexually reproducing organisms....
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This note was uploaded on 09/15/2008 for the course BIOL 1201 taught by Professor Wishtichusen during the Summer '07 term at LSU.
- Summer '07