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Unformatted text preview: LS4 lec 2 Midterm 2Feb 28, 2000 1. 15 pts. Plants with purple flowers crossed to plants with brown flowers yield progeny with purple flowers. Backcrosses of the F1 to the brown parent give 1/4 with purple flowers, 1/4 with blue flowers, 1/4 with green flowers and 1/4 with brown flowers. Does this example illustrate the phenomenon of multiple alleles at one locus or different alleles at multiple loci? Multiple loci Based on the results, define allele symbols and state the genotype of the parent with brown flowers. Use upper case for dominant traits and lower case for recessive traits. bbgg Use the genotypes to state the expected results from a cross of the purple flower F1 to the blue flower plants obtained above. 2.5pts. Albinism, an autosomal recessive condition, is usually rare. However, some of the native populations of Panama have an albino frequency of about one in 625 people. Assuming such a population is in Hardy Weinberg equibrium, what is the frequency of hetrozygous carriers? 3. 10 pts. A survey of the ApoE gene alleles in a sample of 1000 people with the Alzheimer condition (a 3....
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This note was uploaded on 11/30/2009 for the course CHEM 140C taught by Professor Nefzi during the Fall '06 term at UCSD.
- Fall '06
- Organic chemistry