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NOTES-Chapter 12 - Chapter 12 Sexual Reproduction and...

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Chapter 12: Sexual Reproduction and Meiosis Asexual Reproduction- reproduction of an individual w/o combining the genetic material of two individuals Sexual Reproduction- new individual with genetic material from two individuals No vertebrate or insect w/ asexual reproduction Sexual-more genetic variation, raw material on which natural selection occurs Asexual-faster reproduction Sexual- eggs and motile sperm or transfer of nuclei via conjugation tube Meiosis has two basic functions- reduce chromosome number from 2n to n and provide genetic variation by independent assortment and crossing over Telomeres- tandem repeats of base pairs to stabalize chromsomes Euchromatin-part of DNA that is not tightly packed and are actively transcribed Heterochromatin- tightly packed and sometimes never replicate Metacentric- arms are equal in length Acocentric- arms not equal in length Karyotype-chart of all the chromosomes lined up by size Classify by bonding pattern by using stain Humans have 22 regular chromsomes and 1 sex chromosome
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