BIOL 101 1nd Edition Lecture 12 Outline of Last Lecture I. ReproductionII. Eukaryotic Cell CycleIII. Anatomy of ChromosomesIV. CancerOutline of Current Lecture I. Diploid vs. HaploidII. MeiosisIII. Cycle 2 of MeiosisIV. DifferencesCurrent LectureMeiosisClass discussionI. Multicellular organisms like animals, plants, and ourselves inherit one set of chromosomes from each parent when a sperm fertilizes an egg.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.Meiosis, fertilization (zygote, mitosis)II. Meiosis is a type of cell division that produces haploid gametes in diploidorganisms.i. Diploid organisms contain a set of __homologous chromosomes_____ in their____somatic cells_______.ii. The diploid number, or ___2n__, in humans = __46_.iii. Diploid organisms produce __haploid___ gametes.1. Examples: sperm, eggiv. The haploid number, or __n__, in humans =_23_.III. Meiosis reduces the chromosome number from diploid to haploid.i. Diploid or Haploid? diploid cellii. What would the haploid gametes of this cell look like? One cell would have the black chromosomes, one cell would have the white chromosomesiii. What is n=_3_?IV. In meiosis I HOMOLOGOUS CHROMOSOMES (don’t always have the same allele) separate. Illustrate meiosis I below.V. In meiosis II SISTER CHROMATIDS (duplicated chromosome, same allele) separate. Illustrate meiosis II below. Crossing over occurs in prophase one. The DNA does not get replicated the second time. Key differences between meiosis and mitosis Tetrads form during meiosis VI. Chromosomes orient independently at the metaphase platei. What does this mean and how do the equally probable arrangements ofchromosomes contribute to genetic diversity?You never know which chromosomes going to be on which
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