HW1 Problem Set Chapters 1-3.doc

HW1 Problem Set Chapters 1-3.doc - Name Linda Abengowe BIOL...

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Name: Linda Abengowe BIOL 2416, Genetics Jill Buettner, Instructor HW1 - Problem Set Show your work as much as possible. Attach extra pages as needed. I will give partial credit if I can see your thought process, even if the final answer is incorrect. 1) What are the three basic concepts (or parts) of “cell theory?” What scientists are credited for it? The scientists that are credited for cell theory are Schwann and Schleiden. Cell theory consists of 3 parts which is: 1. All life is composed of cells 2. Cells arise from pre-existing cells 3. Cells are the fundamental unit of structure of an living organism 2) In spermatogenesis, four haploid product cells (spermatids) are produced. They are not genetically identical (ie they have different combinations of the alleles for different genes). A. Which 2 meiotic events ensure that they are all genetically different? B. During which phase(s) do each of these events occur? A. The 2 meiotic events that occur to ensure that are all genetically different is the crossing over that ensures that the sister chromatids are no longer identical and random distribution of chromosomes, basically by chance all the maternal chromosomes might migrate to one side and all of the paternal chromosomes to the other. The different migrations produce different combination of chromosomes. B. The crossing over occurs during Prophase 1 and the random distribution of chromosomes occur in Anaphase 1. 3) What are the genotypes and frequencies of the gametes that can be formed in individuals of each of the following diploid genotypes? (DON’T do a cross. Just predict the different gamete genotypes that could be produced by each individual genotype below.) a) AaBb AB, Ab, aB, ab (1/4 for all) b) AaBB AB (1/2) aB (1/2) c)
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