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Biology 1201 Chapter 13 notes

Biology 1201 Chapter 13 notes - Biology 1201 Chapter 13...

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Biology 1201 Chapter 13 notes 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 is the continuity of biological traits from one generation to the next -Results from the transmission of genes. -When individuals share similar genes (e.g., offspring, siblings, etc.) they often resemble each other. --- Variation the inherited differences among individuals of the same species -While offspring resemble their parents and siblings there are still some differences. -Some of these similarities and differences are studied using genetics . --- Genetics the scientific study of heredity and variation >>>>>>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 a sexual and sexual reproduction
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--- Asexual reproduction involves only one parent. Produces genetically identical offspring. --- Sexual reproduction involves two parents and gives rise to offspring with unique combinations of the genes inherited from the two parents 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.
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Biology 1201 Chapter 13 notes - Biology 1201 Chapter 13...

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