SA2b. (3 pts)  Scenario 2 continued: Imagine you have two crabs. You feed one only thick-shelled snails and the other you feed only thin-shelled snails.  Over the course of its life, the crab fed only thick-shelled snails develops larger claws than the crab fed only on thin-shelled snails.  Is this evolution in action? Why or why not?

SA3b. (8 pts) Assembling Biomolecules RNA is composed of [nucleicacidmonomer] monomers connected by [nucleicacidbond] bonds. Proteins are composed of [proteinmonomer] monomers connected by [proteinbond] bonds. Polysaccharides are composed of [polysaccharidemonomer] monomers connected by [polysacaccharidebond] bonds. Triglyerides are composed of  [triglyceridecomponents] connected via a [triglyceridereaction] reactions.

Evaluating Evolution Statements. There are three statements about evolution written below.  Evaluate whether these statements are true or false.  If they are true, write ‘true’.  If they are false, explain why.

Which of the following is NOT a component of cell theory

1B. Table (6 pts) Phenotype Genotype Observed Number Observed Frequency (%) Expected Frequency (%) Brown Body BB 3500 [Observed1] [Expected1] Brown Body Bb 4500 [Observed2] [Expected2] Black Body   bb 2000 [Observed3] [Expected3] Total 10,000 100% 100% *Write your answers as a percent%

Researchers move a set of salamanders to a larger island with shrubs. They intentionally choose salamanders with three body sizes to move: small, medium, and large.  They wanted to understand the strength of natural selection acting on body size. Use the table below to calculate the selection coefficient for the large phenotype. Phenotype: Large Medium Small Chance of survival to mating: 25% 50% 10% Number of offspring if survive: 10 20 10 Fitness (average for an individual with that phenotype): 0.25 x 10 = 2.5 0.5 x 20 =10 0.1 x 10 = 1 Relative fitness: ? ? ? Selection coefficient: ? ? ?

Week 12: Evolution of Animal Behavior: Altruism & Sexual Selection-SHORT ANSWER (12 PTS)

SA4. (12 pts) Match the following cell parts on the left with the statements on the right.

The next three questions reference the following scenario.  The scenario will be repeated for your reference and the unique question will be at the bottom of the scenario. Researchers placed a population of 160 tree-climbing salamanders on an island that had no trees. They measured the length of the individuals in the initial population (top graph). Twenty years later, the researchers returned to the island. They measured the length of the salamanders they found on the island (bottom graph). They saw the pattern in body size below: Question: Can researchers be sure the population evolved?

Week 6: Gene Expression