In a certain population, there exists a recessive disease which causes death by the age of 5 years. You study this population and discover that all the homozygous recessive individuals have died. Two years later, you find homozygous recessive individuals are back in the population. There has been no gene flow, so from where did these individuals come?

An island had an equal proportion of white- and black-coated mice. Eagles found the island and threatened the population of the white-coated mice, since they were easily spotted. What effect would this selection pressure probably have on the mouse population? The population continued to consist of mice with both black and white coats. The population changed to consist of mostly black-coated mice. The population of white- and black-coated mice mutated to have a brown coat. The population changed to consist of mostly white-coated mice.

Consider a recessive condition where 40% of the affected individuals pass away by the age of 10 but those that survive to adulthood are just as likely to have children as the general population. What must the new mutation rate be if the incidence of the disorder is 1/10,000 to maintain a consistent incidence across generations? Answer format: Fraction - #/#

Why are some lethal recessive mutations such as Tay-Sachs disease not eliminated from a population? Consider rare disorders in a population caused by an autosomal recessive mutation. From the frequencies of the disorder in the population given, calculate the frequency of carriers (heterozygous individuals). Assume Hardy-Weinberg Equilibrium. Disease or Disorder Frequency: 0.64%

Both mutation rate and population size influence genetic diversity, but they do so to different degrees. Which of the following is WRONG as a comparison of genetic diversity between two populations? O a. Cheetah population (100 individuals ) > Nycterophilia bat flies that live on them d. Forest owlet (between 70 and 400 individuals) >> Ridgway's hawk (maximum 50 individuals) e. cardinalflower (Northeast and South of North America) >> smooth azalea (only in the Eastern seaboard)

The following questions refer to this information: In the year 2500, 5 male space colonists and 5 female space colonists from Earth settle on an uninhabited Earthlike planet in the Andromeda galaxy. The colonists and their offspring randomly mate for generations.  If 4 of the original colonists died before they produced offspring, the ratios of the genotypes could be quite different in the subsequent generations. This is an example of what kind of selection?After many generations, the population on this planet has an unusually high frequency for the incidence of retinitis pigmentosa (a hereditary disease that impacts night vision), relative to Earth’s population. This is most likely due to what?

Some fish in a murky underground lake have lighter scales than the others. this makes it slightly harder for the lighter fish to escape detection by predators, but most light-colored fish live long enough to reproduce. a natural event separates the dark-scaled fish from their light-scaled cousins, and as a result, a new species of dark-scaled fish emerge. Which statement accurately describes the scenario? The fish survived because of an inheritable advantage. The fish experienced an evolutionary change because of genetic drift. The fish experienced an evolutionary change because of natural selection. The fish survived because of a non-genetic advantage.

Imagine three islands, each with a population of frogs. There are approximately 1,100 frogs on Island 1, 400 on Island 2, and 400 on Island 3. Researchers estimate that these populations have been separated for 800 years. Individuals in these populations show variation in markings on their body by shape and color. Frogs on Islands 1 and 2 have circle markings that are either red, blue, or purple. All frogs on Island 3 have yellow triangle markings.  The islands recently became a tourist destination, with new passenger boats connecting Island 1 and Island 2, and Island 1 and Island 3 (there is no boat that goes between Island 2 and Island 3).   Would a biologist agree or disagree with the following statements?  part 1:  It is possible that yellow or triangle markings exists on Island 1 at some point in the past. Question options:   Agree   Disagree part 2:  Genetic drift is not occurring on Island 1.   Question options:…

A population of lizards colonizes a region and feeds on small arthropod species. Over time, a small group within the population starts eating different types of worms. Over time, this group develops inherited traits that help them catch, eat, and digest the worms. The two lizard groups share the same habitat but no longer recognize each other’s mating calls. What does this scenario best describe?     A. speciation without geographic isolation   B. natural selection without speciation   C. increased genetic variation without speciation   D. decreased genetic variation with geographic isolation

A farmer uses an herbicide called triazine to control pigweed in his field.  Initially, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed.  Which of these is the best explanation for what happened? Group of answer choices:   Natural selection favored triazine-resistant pigweed, which was more likely to survive and reproduce. Some pigweed plants adapted to become resistant to triazine and passed the trait to their progeny. Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. The herbicide company lost its triazine formula and started selling lower-quality triazine. Triazine-sensitive pigweed is less efficient at photosynthesis.