LS15 MIDTERM EXAM QUESTIONS AND 100% CORRECT ANSWERS.

LS15 MIDTERM EXAM QUESTIONS AND 100% CORRECT ANSWERS. A controlled experiment occurs when : - ANSWER-groups are kept as similar as possible and are treated identically, except for the variable of interest. .A trait is analyzed using a pedigree diagram. More males than females appear to be affected. This mode of inheritance of this trait is most likely: - ANSWER-- sex-linked recessive .A typical human gamete: - ANSWER-- is haploid - contains an X or Y chromosome, but not both - is the product of meiosis - contains genetic material that had undergone recombination .Among several insects ( ants, bees, and wasps), we see what appears to be extreme altruism in the form of : - ANSWER-- individuals forging reproduction in order to help their mother produce more offspring .an individual who possesses 2 of the same alleles for a gene is : - ANSWER-- homozygous .anecdotal evidence - ANSWER-- information based on nonfactual data. - based on experiences of other people or the media, aka (word or mouth ) -can seem to reveal links between two phenomena even though the links do not actually exist. - often used in contrast to scientific evidence - can not be used to prove anything. .Anti-bacterial soaps have become a public health concern because dangerous antibiotic-resistant bacteria strains have become more prevalent. Scientists attribute this increased prevalence to natural selection. Which of the following statements about the evolution of antibiotic-resistant bacteria is true ? - ANSWER-- Anti-bacterial soap is an environment in which bacteria harboring antibiotic-resistant genes can flourish .Are gametes haploid or diploid in humans ? - ANSWER--Haploid .As predator and prey species coevolve, they are constantly engaged in an evolutionary struggle. This is an example of ? - ANSWER-- environments around a given species constantly changing .As the average coefficient of relatedness among the individuals within a group increases, which is the following would you expect to occur? - ANSWER-- an increase in coorperative behaviors