Question

1. Many people think that individual organisms can intentionally grow (& pass on to their descendants) new traits that will make them better adapted to their environment. This inaccurate idea of evolution was first described by a. Wallace. b. Lamarck. e. Darwin. d. Cuvier. e. Linnaeus. 2. Which of the following scenarios demonstrates biological evolutionary change? a. humans developing dementia in their old age c. increasing proportion of cockroaches resistant to insecticides b. tadpoles turning into a frogs d. spread" (metastasis) of cancer cells to other body tissues 3. Of the following structures, which is a homologous pair of traits? a. bat wing and human arm hand c. insect wing and bird wing b. bacterial flagellum & protist flagellum d. dolphin fin and stingray fin 4. Which of the following conditions would tend to cause deviation from the Hardy-Weinberg equilibrium, and, hence may result in microevolution? a. absence of selection pressure b. isolated population c. random mating d. shrunk population size 5. The universality of the genetic code a. is an example of molecular homology b. is a strong evidence for the evolutionary relatedness of all life forms c. a & bare true d. neither a nor b is true

Answer 1

1. Carlos Linnaeus gave the "inheritance of acquired characters". The characters or traits acquired by the individuals during there lifetime for their survival under the adverse conditions are inherited into their progeny. Answer - E.

2. Biological evolutionary change is brought about by natural selection. Variation within in a population is the basis of natural selection. Within the population of cockroaches there were variants that were resistant to the insecticides. The application of insecticides selects the resistant cockroaches and enable them to produce progeny. Answer - C.

3. Homologous traits are structures or features that have fundamental similarity within the different organisms suggesting their common ancestor. Answer - A.

4. The population will remain in Hardy-Weinberg equilibrium in the absence of natural selection, mutation, gene flow and genectic drift. The shrunk population size will disturb the Hardy-Weinberg equlibrium due to the bottle neck effect and founders effect. Answer - D.

5.Going into the genes is like studying the molecular biology of variation and evolution. Genetic code reveal the connections between different life forms on this earth whether living or dead. Answer - C.