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Unformatted text preview: Bio 201 Fall 2011 Posted practice questions Week 3 09‐12‐11 – lecture 30% of the wild carrot plants die regardless of how well adapted they were because a walking path is constructed through a field. The resulting change in allele frequencies in the wild carrot population in that field is an example of (a) natural selection (b) sexual selection (c) reinforcement of pre‐existing reproductive isolation (d) sympatric speciation (e) genetic drift Which of the following is an example of pre‐mating reproductive isolation (a) sperm and egg from different populations being incapable of completing fertilization (b) females from one species being incapable of responding to the mating dance of males of a different species (c) hybrids between two allopatric populations suffering 75% mortality before reproductive maturity (d) hybrids between two species being poorly adaptive to the environment of either parental species (e) females being incapable of storing sperm in their reproductive tracts following copulation by males from a different species 09‐14‐11 lecture Why would a zygote produced from a hybridization between a diploid and a tetraploid species of plants likely have low fitness (a) it would likely have a small body size (b) it would have low fertility due to unbalanced chromosome numbers in its gametes (c) it would seldom be able to grow at all (d) it would produce too many offspring for the environment to support (e) it would not likely be able to produce flowers Two populations of mice become completely isolated for 100 million years during which their environments do not change significantly from their ancestral shared environment. What is likely to have occurred as a "by‐product" of this situation. Assume that the populations have not yet come into contact again. (a) evolution of different body colors (b) evolution of different body sizes (c) evolution of mating incompatibilities (d) selection in one population against the potential for mating with the other population (e) inability of either species to survive an environmental change 09‐16‐11 lecture Which of the following statements is not true about synonymous substitutions (a) they do not change the amino acid sequence of the encoded protein (b) they are often thought to have strong deleterious effects (c) they are usually more common than non‐synonymous substitutions (d) they can only occur in cases in which an amino acid is encoded by more than one codon (e) they cannot occur in introns A pseudogene is (a) a functional gene that is a copy of another functional gene (b) a gene that has been transcriptionally or translationally inactivated by a base pair mutation but that can still be seen in the genome (c) a gene in a parasitic organism (d) a gene that has multiple names in the published scientific literature (e) a gene sequence that is recognized by a human researcher but that was overlooked by a computer analysis TRY TO FIGURE THE ANSWERS OUT YOURSELF WITH THE NOTES AND TEXTBOOK AS YOUR GUIDE. IF YOU NEED HELP, PLEASE ASK YOUR TA’S DURING THEIR OFFICE HOURS ...
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This note was uploaded on 09/29/2011 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.
- Spring '08