BIOLOGY 1101 Lecture Notes - Lecture 10: Genetic Recombination, Prophase, Golden Rice
27 Sep 2016
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Adding, deleting, or transplanting genes from one organism to another, to alter the organisms in useful ways. Influencing the expression of genes that are already present in the organism. o. Can improve food nutrition and make farming more efficient: old school: selective breeding, new school: inserting specific genes. Resistance against chemicals they use to kill weeds. Faster growth and bigger bodies: almost everyone in the u. s. uses genetically modified crops regularly without knowing it. Meiosis: generates sperm and eggs and a great deal of variation, gametes. 23 chromosomes = 46 chromatids: haploid (n) A cell with unpaired chromosomes: mitosis occurs almost everywhere in an animal"s body. Meiosis only occurs in one place gonads. o. Sexual organisms must halve chromatids to maintain the correct number for each chromosome after fertilization. o. It reduces the amount of genetic material in gametes. It produces gametes that all differ from each other with respect to the combinations of alleles they carry. o.
