Test III - KEY

Test III - KEY - Questions #1-5 refer to the following...

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Questions #1-5 refer to the following information. Populations of European clover, Trifolium repens , produce cyanide, which increases their resistance to herbivores such as mice and slugs. However, production of cyanide is energetically costly to the plants. Cyanide production is determined at single gene locus and is dominant (i.e., non-cyanide plants are homozygous recessive). 1. A student notes that the frequency of plants that produce cyanide varies among populations in Europe. She states that ‘selective pressure by herbivores maintains cyanide-producing plants in clover populations’. This statement best represents which part of the scientific method? a. observation *b. hypothesis c. prediction d. result e. conclusion 2. In 2004, she counts the frequency of cyanide plants and finds that 36% of all plants do not produced cyanide, and 64% are cyanide producers. Based upon this information, what can she conclude about the frequency of the non-cyanide allele in this population? a. the frequency of the allele is .36 b. the frequency of the allele is .13 *c. the frequency of the allele is .6 d. the frequency of the allele is .4 e. there is not enough information to determine the frequency of the non-cyanide allele In 2004, the student performs an experiment. She divides the population into 8 sections. In 4 of the 8 sections she constructs a barrier that excludes all herbivores, including, mice and slugs. The other 4 sections are open to all herbivores. In 2007, she then determines the frequency of cyanide and non-cyanide plants in the sections, with the following results (bars are the mean frequency of cyanide plants in the four sections of each treatment in 2004 (before the experiment began) and 3 years later in 2007): Mean Percent Cyanide Plants 0 20 40 60 80 100 2004 2007 Barrier No Barrier 1
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3. Based upon these results, what is the best conclusion regarding the statement she made (in Question #1)? *a. the results support the statement that herbivores maintain cyanide-producing plants in this population b. the results fail to support the statement that herbivores maintain cyanide-producing plants in this population c. the results suggest that herbivores reduce cyanide-producing plants in this population d. the results suggest that migration via seeds must affect the frequency of cyanide- producing plants in this population 4. The population in 2004 had 36% non-cyanide and 64% cyanide plants. After installing the barrier, the plants in these experimental sections in 2007 had a mean of 81% non- cyanide and 19% cyanide plants. In the experimental, barrier sections, what is the genotypic frequency of expected heterozygotes in 2007 (one cyanide allele, one non- cyanide allele)? a. 81%
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Test III - KEY - Questions #1-5 refer to the following...

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