BIOL 101 1nd Edition Lecture 13 Outline of Last Lecture I. Diploid vs. HaploidII. MeiosisIII. Cycle 2 of MeiosisIV. DifferencesOutline of Current Lecture I. Errors in MeiosisII. Inherited Traitsa. Allelesb. DominanceCurrent LectureI. 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 failto separate.Inherited traitsI. 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 type6. 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
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