GENPROB_short answers

GENPROB_short answers - Page 1 Due Date Genetics Problems...

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Page 1: Due Date Genetics Problems Name_________________________________ Write complete, clear solutions to these problems. Define all symbols. 1. Consider a pea plant that is dwarf, has purple flowers and produces yellow seeds. In peas, tall is dominant to short, purple-flowered is dominant to white-flowered and yellow seeds are dominant to green seeds. Assume that the plant is heterozygous for any characters expressing the dominant phenotypes. Also assume that the 3 characters are coded for by 3 genes located on non-homologous chromosomes. a. Write the genotype of this plant. b. What are gametes? Gametes are eggs/sperm. Gametes are haploid. c. How many kinds of gametes can this plant produce? (Note: you are not asked to cross this plant to any other plant or to itself.) d. Diagram interphase, metaphase I, telophase I, metaphase II and anaphase II of meiosis in this plant. In your diagrams, include enough chromosomes to satisfy the requirements of this problem and diagram the alleles of this problem by putting symbols on the chromosomes. First define your symbols using one letter of the alphabet for each gene: T = tall;   t = dwarf P = purple flowers;   p= white flowers Y = yellow seeds;   y = green seeds Then determine the genotype:  a dwarf, purple flowered, yellow seeded plant that is heterozygous for all dominant  The major problem here is to apply Mendel’s Law of Segregation accurately.  Remember, each gamete receives one allele  for each character (gene).  So in this case, one “tee”, one “pee” and one “why” The parent plant has only 1 type of “tee” allele, so all gametes will get t but there are 2 possible alleles to pass on for the other two genes, so there are 1x2x2 = 4 possible kinds of gametes  (tPY, tpY, tPy, tpy) Here are the 1 st 3 diagrams
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Page 2: Due Date Genetics Problems Name_________________________________ 2. Hemochromatosis is a recessive blood disorder. A normal woman whose mother has hemochromatosis marries a phenotypically normal man whose father had hemochromatosis.
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This note was uploaded on 04/21/2008 for the course BIOL 400 taught by Professor Scott during the Spring '08 term at Los Rios Colleges.

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GENPROB_short answers - Page 1 Due Date Genetics Problems...

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