BIOL 101 1nd Edition Lecture 13 Outline of Last Lecture I Diploid vs Haploid II Meiosis III Cycle 2 of Meiosis IV Differences Outline of Current Lecture I Errors in Meiosis II Inherited Traits a Alleles b Dominance Current Lecture I Errors in meiosis lead to nondisjunction of the chromosomes i When nondisjunction occurs in meiosis I a pair of homologous fail to separate ii When nondisjuction occurs in meiosis II a pair of sister chromatids fail to separate Inherited traits I Traits are passed one from one generation to the next in the form of alleles i What is an allele A different form of a gene 1 When individuals have two of the SAME alleles they are homozygous 2 When individuals have two DIFFERENT alleles they are heterozygous 3 Dominant alleles determine the organisms appearance 4 recessive alleles have no obvious effect on the organisms appearance 5 As diploid organisms we carry 2 alleles for each gene in our genome Within populations however many alleles may correspond to a single gene For example blood type 6 Alleles can be either incompletely dominant or codominant These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute
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