BIOL 1001 WEEK 4 EXAM 2 – QUESTION AND ANSWERS Walden University 2020

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H Exams Review Test Submission: Exam ­ Week 4 Review Test Submission: Exam ­ Week 4 User Course BIOL­1001P­8/BIOL­1001L­8/BIOL­1001­8­Introduction to Biology2017 Spring Qtr 02/27­0... 5/21­PT5 Test Exam ­ Week 4 Started 5/4/17 7:18 PM Submitted 5/4/17 8:25 PM Due Date 5/8/17 1:59 AM Status Completed Attempt Score 50 out of 50 points Time Elapsed 1 hour, 6 minutes out of 1 hour and 30 minutes Instructions Please answer each question below and click Submit when you have completed the Exam. Results Correct Answers Displayed Question 1 3 out of 3 points In land mammals, the pelvic girdle serves to connect the legs to the rest of the skeleton. Whales have a small residual pelvic girdle that does not attach to anything. This is an example of _. Correct Answer: e. All of the above Question 2 A heterozygous organism: Correct Answer: b. Has two different alleles of a gene 3 out of 3 points Question 3 Evidence for evolution includes: Correct Answer: e. All of the above 2 out of 2 points Question 4 2 out of 2 points You discover a primate fossil while on an expedition in Africa. Which part of the skeleton would you be most interested in examining in order to classify this primate as a human or a nonhuman primate? Correct Answer: b. The base of the skull Question 5 Because of the law of independent assortment: Correct Answer: c. Two typical siblings will have about 50% of their alleles in common. 2 out of 2 points Question 6 3 out of 3 points What is the role of fossils in supporting the theory of common descent? Correct b. Answer: There have been many fossils of intermediate types discovered that provide strong support for the theory of common descent. Question 7 3 out of 3 points Which of the following statements is false? Correct c. Answer: Mating between individuals with dominant phenotypes cannot produce offspring with recessive phenotypes. Question 8 Dihybrid crosses involve trait(s). Correct Answer: e. 2 2 out of 2 points Question 9 3 out of 3 points Cystic fibrosis is caused by the allele f, which is completely recessive to the normal dominant allele F. Consider a couple with the genotype Ff. What is the chance that their first child will develop cystic fibrosis? Correct Answer: e. 25% Question 10 2 out of 2 points In humans, heterozygotes are referred to as , particularly when the recessive allele is associated with a genetic disease. Correct Answer: c. Carriers Question 11 3 out of 3 points How could two parents with curly hair (a dominant condition) have boys and girls with straight hair (a recessive condition)? Correct b. Answer: The recessive condition could happen if both parents were heterozygous carriers of the recessive allele. Question 12 2 out of 2 points How many genetically different types of sperm could an animal that is heterozygous­dominant for one trait produce? Correct Answer: d. 2 Question 13 A mutation in a gene: Correct Answer: c. Might have no effect on the protein encoded by the gene 3 out of 3 points Question 14 3 out of 3 points Assuming that the genes are on separate chromosomes, an organism with the genotype AaBb will make gametes in the following proportions: 1/4 AB, 1/4 Ab, 1/4 aB, and 1/4 ab. This is an example of: Correct Answer: d. Independent assortment Question 15 Phenotypic features that are coded for by several genes, such as eye color in humans, are called: Correct Answer: e. Polygenic 2 out of 2 points Question 16 Match each model of life on earth in column 1 with its description in column 2. Question Correct Match 3 out of 3 points Static Model b. Species arise separately and do not change over time. Separate c. types Species do change over time and new species can arise, but each group of species derives from a separate ancestor that arose independently. Transformation a. Species arise separately but do change over time to adapt to the changing environment. Common d. descent Species do change over time to adapt, and new species can arise. All species derive from a common ancestor. Question 17 2 out of 2 points DNA is often likened to an instruction manual. According to this analogy, the typographical errors that would inevitably result when the DNA “manual” is transcribed would be similar to: Correct Answer: b. Mutations Question 18 3 out of 3 points Bat wings are homologous to the front legs of cats. What does the term homologous mean in this context? Correct b. Answer: The limbs share a common set of bones organized in the same way despite different functions. Question 19 2 out of 2 points Which of the following groupings are in order from broadest to narrowest? Correct Answer: a. Class, family, species Question 20 2 out of 2 points If a blue­colored flower crossed with a white­colored flower produced light blue­colored flower offspring, then it’s most likely a case of: Correct Answer: a. Incomplete dominance Thursday, May 4, 2017 8:25:33 PM EDT ← OK [Show More]

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