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BIO 325 Discussion 1 Fall 2009

BIO 325 Discussion 1 Fall 2009 - GENETICS(BIO 325 Fall 2009...

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GENETICS (BIO 325) Fall 2009 Discussion 1 _____________________________________________________________ 1. Which of the following are examples of monohybrid crosses? (a) A/a x a/a (b) A/a x A/a (c) A/a; B/b x a/a;b/b (d) A/a; B/b x A/a; B/b (e) A/a; B/B x A/a; B/B Monohybrid Crosses means HETEROZYGOUS at a single locos. 2. Yellow leaves on a plant can be caused by genetic mutations, infection by viruses, or unfavorable environmental conditions. Suppose you find a plant that has yellow leaves and want to determine if the cause of the phenotype is a genetic mutation or an environmental stress. Design an experiment to differentiate between these different possibilities. Cross the yellow leaf mutant plant with a normal plant to find patterns in the F1 generation. 3. Suppose that red flower color (R/R or R/r) is dominant to white flower color (r/r) in Petunia. A friend has a petunia plant with red flowers and wants to determine whether the plant is R/R or R/r. In order to determine the genotype, you cross it with a white-flowered petunia. (a) What is the name of the cross that you performed? Test Cross (b) How will this cross help you determine the genotype of the red-flowered petunia? That is, how will the results from this cross differ if the red- flowered petunia is R/R vs R/r?
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