This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: c. What are the new p and q values? How do they compare with the values from 1990? q 2 = 18/100 = .18 so q = .424. p + q = 1 so p = .576 p has decreased and q has increased. There are more recessive alleles in the population today. There are many reasons why this apparent change could have occurred. Come up with an East Kentwood example for each: Small population Size: Maybe Mr. V’s sample size is too small to accurately predict the proportion of the population that is left handed. Maybe his small sample just selected many lefties purely by chance. Nonrandom Mating: Women are more naturally attracted to lefties and have had more babies with left handed males than right handed males since 1990. Mutations: The chemicals in Mr. V’s room are causing mutations leading to more lefties Gene Flow: Lefties are generally smarter than righties and love AP classes, so lefties from other school districts have been moving to Kentwood because of the strong AP program here. Natural Selection: Left handed people are better drivers and are much less likely to die in a car accident. Surface area to Volume and Water Potential Review 1) Cells throughout the world have variable shapes and sizes. Because of this, and because structure is designed around function, certain shapes are optimal for certain processes. Analyze the following cells (units not to scale), and determine the following… Cell 1 (spherical) where the radius is 3 mm Cell 2 (flat and rectangular) where the height is 0.5mm, length is 4mm, width is 2mm A) What is the surface area to volume ratio of both cells? How to calculate Surface Area? Surface area How to calculate Volume? Volume Surface area to Volume Ratio Cell 1 = 4 π r 2 4 π (3) 2 = 113 mm 2 4/3 π r 3 4/3 π (3) 3 = 113mm 3 133/133 = 1:1 Cell 2 = Σ a 16 + 4 + 2 = 22 mm 2 L x W x H 0.5 x 2 x4 = 4 mm 3 22:4 = 11:2 B) Conclusion: Compare the ratios and explain why one cell would be more efficient than another. As a cell increases in size, the volume grows at a faster rate than the surface area. As cells increase in volume, the relative surface area decreases and demand for material resources increases. These limitations restrict cell size. When the cell is too big, transport throughout the cell is over a longer distance. This means that it takes longer for nutrients to diffuse to where they are needed in the cell. In addition it takes longer to remove wastes. If a cell gets too big, the cell will have very little surface area compared to its volume to allow enough materials in and out of the cell. C) Are you made of lots of large cells or lots of small cells? Why? How do you actually grow in height? Made of small cells. They have a high surface area to volume ratio (see above) You grow in height by making MORE cells. While cells will grow in size, they will reach a limit of efficiency, and then perform mitosis....
View
Full Document
 Fall '11
 Boyle
 Biology, Population Ecology, Lefthandedness, Zygosity

Click to edit the document details