Walden University BIOL1001 WEEK 4 EXAM. Questions and Answers (Graded A).

Question 1 How could two parents with curly hair (a dominant condition) have boys and girls with straight hair (a recessive condition)? Answer: D. The recessive condition could happen if both parents were heterozygous carriers of the recessive allele. Question 2 What is the role of fossils in supporting the theory of common descent? Answer: C. There have been many fossils of intermediate types discovered that provide strong support for the theory of common descent. Question 3 If a blue-colored flower crossed with a white-colored flower produced light bluecolored flower offspring, then it’s most likely a case of: Answer: A. Incomplete dominance Question 4 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: Answer: D. Mutations Question 5 Match each model of life on earth in column 1 with its description in column 2. Question Correct Match Static Model B. Species arise separately and do not change over time. This study source was downloaded by from CourseH on :38:39 GMT -05:00 Separate types D. 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 descent C. Species do change over time to adapt, and new species can arise. All species derive from a common ancestor. Question 6 A mutation in a gene: Answer: D. Might have no effect on the protein encoded by the gene Question 7 Phenotypic features that are coded for by several genes, such as eye color in humans, are called: Answer: D. Polygenic Question 8 Which of the following groupings are in order from broadest to narrowest? Answer: E. Class, family, species Question 9 Because of the law of independent assortment: Answer: C. Two typical siblings will have about 50% of their alleles in common. Question 10 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? Answer: C. The base of the skull This study source was downloaded by from CourseH on :38:39 GMT -05:00 Question 11 Bat wings are homologous to the front legs of cats. What does the term homologous mean in this context? Answer: A. The limbs share a common set of bones organized in the same way despite different functions. Question 12 In humans, heterozygotes are referred to as , particularly when the recessive allele is associated with a genetic disease. Answer: A. Carriers Question 13 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: Answer: B. Independent assortment Question 14 Which of the following statements is false? Answer: E. Mating between individuals with dominant phenotypes cannot produce offspring with recessive phenotypes. Question 15 A heterozygous organism: Answer: A. has two different alleles of a gene Question 16 Evidence for evolution includes: Answer: E. All of the above