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Biology EXAm 3 UNT 1710

Biology EXAm 3 UNT 1710 - Principles of Biology I Exam III...

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Principles of Biology I Name:_____________________________ Exam III, Fall ‘05 Read all of the possible answers for each question before choosing the BEST ANSWER. 1. Mendel chose two true breeding cultivars of the pea for an experiment. One had purple flowers and the other white. Later, when he had completed his experiment and was recording the results, these two cultivars would be called: a. the parental (P) generation. b. the first filial (F 1 ) generation. c. the second filial (F 2 ) generation. d. hybrids. e. generation X. 2. The height of a human male seems to vary widely with no obvious individual phenotypes (individuals can be found that represent virtually all different heights over a rather wide range). This is primarily an example of the phenomenon called: a. continuous variation. b. epistasis. c. pleiotrophism. d. independent assortment. e. environmental effects. 3. The chromosomal theory of inheritance is commonly attributed to: 4. The arctic fox has a white fur coat in the winter but a reddish brown coat in the summer. This is an example of: 5. The ultimate source/mechanism for the introduction of new alleles into a species is:
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6. A time traveler has brought Mendel “back to the future” and he has now accepted a position at UNT. He decides to continue his work and begins by performing a dihybrid cross for pea pod shape and plant height. These are the two loci are located very close to each other on chromosome four and therefore do not assort independently during meiosis. Unfortunately Mendel does not keep up with the literature and doesn’t know this. If he properly interprets his new results, Mendel will now rediscover: a. epistasis. b. crossover fixation. c. linkage. d. codominance. e. why he never performed this cross in the 1800’s.. 7. Humans cannot tolerate a variable number of chromosomes in a developing embryo and yet the male embryo has one X chromosome and the female has two. The X chromosome is also large and carries many genes. We now know that the female cells compensate for this problem by forming a/an:
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