In an environment in which members of a population compete w…

In an environment in which members of a population compete with each other for resources, a change occurs that selects against members that exhibit a particular dominant trait (the trait exhibits complete dominance). Which of the following graphs best depicts the trends in genotypic frequencies that would be expected to occur over time?

As bottlenecks go, they don’t get much narrower: based on a…

As bottlenecks go, they don’t get much narrower: based on a genetic study, scientists found that Florida panthers, nearly wiped out in the early 20th century, dropped to a population size of as little as six animals. Scientists compared DNA samples taken from museum specimens from the 19th century with samples from the 1980s. They found that the late 20th century cats had only a third of the genetic diversity of their 19th century ancestors. The bottleneck caused widespread health defects in the wild cats, including undescended testicles and poor sperm quality. A “genetic rescue” experiment was launched in Florida in 1995, when eight female pumas from Texas were introduced to the Florida panthers. The question is: which evolutionary mechanism is purposefully used in this “genetic rescue”?

A 31-year-old male who was diagnosed with asthma at age 7 ye…

A 31-year-old male who was diagnosed with asthma at age 7 years developed symptoms of intermittent wheezing and shortness of breath precipitated by a recent exercise bout. Which of the following recommendations would BEST improve this patient’s tolerance to exercise?