6. which of the following examples describes a population where genetic drift is most likely to have the largest effects on allele frequencies? monarch butterfly populations decrease because overwintering grounds in mexico are deforested. a population of songbirds is reduced by 50% due to low food availability during a very cold, harsh winter. a storm causes a few mockingbirds to be transported from mainland south america to distant islands. the islands had no mockingbirds prior to the storm. the mockingbirds which colonize the islands and have a different set of allele frequencies than the mainland population. cackling geese used to be considered a subspecies of canada geese, but now cackling geese are considered a separate species. cackling geese are smaller with a shorter bill than canada geese. when cackling geese and canada geese mate, no offspring survive. black bears and grizzly bears interbreed (rarely) where their geographic ranges overlap.

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip. nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule. true/false

Explain the difference between incomplete dominance and codominance

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased