Wi09 Homework 3

Wi09 Homework 3 - Genetics Homework #3 – Due in lecture...

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Unformatted text preview: Genetics Homework #3 – Due in lecture Wednesday, February 11 You must include your name, your Student ID, your TA’s name, and your section number at the top of your paper. You may type or write, as long as it is neat and legible. 1. The flower colors of plants in a particular population may be blue, purple, turquoise, light‐blue, or white. A series of crosses between different members of the population produced the following results: Cross Parents Progeny 1 2 3 4 5 6 7 8 9 10 11 12 13 purple x blue purple x purple blue x blue purple x turquoise purple x purple purple x blue purple x blue turquoise x turquoise purple x blue light‐blue x light‐blue turquoise x white white x white purple x white all purple 76 purple, 25 turquoise 86 blue, 29 turquoise 49 purple, 52 turquoise 69 purple, 22 blue 50 purple, 51 blue 54 purple, 26 blue, 25 turquoise all turquoise 49 purple, 25 blue, 23 light‐blue 60 light‐blue, 29 turquoise, 31 white all light‐blue all white all purple How many genes and alleles are involved in the inheritance of flower color? Indicate all possible genotypes for the following phenotypes: purple; blue; turquoise; light‐blue; white. 2. Consider the following hypothetical scheme of determination of coat color in a mammal. Gene A controls the conversion of a white pigment P into a gray pigment Q; the dominant allele A produces the enzyme necessary for this conversion, and the recessive allele a produces an enzyme without biochemical activity. Gene B controls the conversion of the gray pigment Q into a black pigment R; the dominant allele B produces the active enzyme for this conversion, and the recessive allele b produces an enzyme without activity. The dominant allele C of a third gene produces a polypeptide that completely inhibits the activity of the enzyme produced by gene A; that is, it prevents the reaction P Q. Allele c of this gene produces a defective polypeptide that does not inhibit the reaction P Q. Genes A, B and C assort independently, and no other genes are involved. In the F2 of the cross AAbbCC x aaBBcc, what is the expected phenotypic segregation ratio? ...
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This note was uploaded on 09/01/2011 for the course BICD 100 taught by Professor Nehring during the Winter '08 term at UCSD.

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