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Problem Set 2 - Biology 202 Problem Set 2 This problem set...

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Biology 202 Problem Set 2 1/28/11 This problem set covers material from January 19 th through January 26 th From Griffiths et al.: Chapter 2, problems 4, 8, 20, 22, 24, 28, 29, 30, 38, 39, 46, 47, 48,52, 53, 64 Chapter 6, problems 7, 8, 9, 12, 13, 14, 16, 23 Hand in answers to the following questions, due on February 4 th 1. You’re working on golden rice, a plant that promises to alleviate nutritional deficiencies in some developing countries. You cross two true breeding plants. One parent has fat grains, wavy leaves, red flowers and is short in stature, while the other parent expresses the contrasting phenotypes of thin grains, straight leaves, white flowers and is tall in stature. The four pairs of contrasting traits are controlled by four genes, each located on a separate chromosome. In the F 1 , only fat grains, straight leaves, red flowers, and tall stature were expressed. In the F 2 , all possible combinations of these traits were expressed in ratios consistent with Mendelian inheritance. (a) What conclusions can you draw about dominance relationships from the F1 results? (b) In the F 2 results, which phenotype appeared most frequently? Calculate the probability of this phenotype occurring. (c) Which F 2 phenotype is expected to occur least frequently? Calculate the probability of this phenotype occurring. (d) In the F 2 generation, what is the probability of getting one or the other parental (p generation) phenotypes?
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  • Spring '08
  • Kieber-Hogan
  • Biology, X-linked dominant disorder, heterozygous female, incompletely dominant alleles, recessive color-blindness allele, heterozygous female Drosophila

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