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third exam bio 1406 fall 2006 mwf 100 answers

third exam bio 1406 fall 2006 mwf 100 answers -...

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Introductory Biology, Biology 1406. TAMU-CC. 3 rd lecture exam 10 November 2006. Learning community sections 1. If an organism has allele 1 and allele 3, which are found on question 21, which allele is likely to be the dominant allele? a. allele 1 b. allele 3 c. neither allele d. both alleles Allele 1 because allele 3 makes a product that is likely to be non-functional 2. If an organism has alleles 1 and 2 from question 21 it is: a. homozygous because the DNA sequence of allele 1 and 2 are the same b. heterozygous because the protein products of allele 1 and 2 are different c. heterozygous because the DNA sequence of allele 1 and 2 are different heterozygous and homozygous have to do with the DNA sequence not the product the allele makes 3. If the dominance relationship between alleles is codominance, would an organism with alleles 1 and 4 from question 21 display a different phenotype than an organism homozygous for allele 1? a. yes b. no c. it might, it depends on the function of the different product produced by allele 4 No. Even if the dominance between the alleles is one of codominance, if each allele makes a functional product, the products are the same! 4. At the start of the experiment, all nitrogen in the DNA of bacteria is heavy nitrogen ( 15 N). When the bacteria divide, the normal isotope of nitrogen ( 14 N) is used to make the new DNA strands. After TWO rounds of replication using the normal isotope of nitrogen the resulting DNA is centrifuged in a cesium gradient. Tube 1 supports the hypothesis of semiconservative DNA replication and tube 4 supports the hypothesis of conservative replication. 5. In a roan shorthorn bull, a cell divides. After cell division, the resulting cells only have red or white alleles. How did this cell divide? a. mitosis b. meiosis c. cannot determine Before cell division, cells had pairs of chromosomes. After cell division, cells are haploid. The cell divided by meiosis. 6. A pea plant true breeding for round seeds was crossed with a plant true breeding for wrinkled seeds. All offspring of this cross had round seeds. The dominance relationship between the alleles for seed shape is: If you see one trait or the other, the dominance relationship is complete dominance.
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