Contribution to the gene pool of penguins that live there have lost the next generation the ability to fly. Genetic variability A biologist studies a population of squirrels for 15 years. During this time, the population always remains between Structures as different as human arms, 30 45 squirrels. His data shows that bat wings, and dolphin flippers contain – more than ½ of the squirrels born do not many of the same bones, these bones survive to reproduce, due to competition having developed from very similar for food and predation. Then, in a single embryonic tissues. How do biologists generation, 90% of the squirrels born interpret these similarities? live to reproduce, and the population By identifying the bones as being increases to 80. Which inference(s) homologous structures about this population might be By the principle of convergent true? The amount of available food evolution may have increased. By proposing that humans, bats, The number of predators may and dolphins share a common have decreased. ancestor The squirrels of subsequent A and C only generations should show greater A, B, and C levels of genetic variation than previous generations, because squirrels that would not have Which of the following is probably the survived in the past will now best explanation for the fact that survive. Antarctic penguins cannot fly, although A and B only there is evidence that millions of years A, B, and C ago their ancestors could do so? Penguins live on land and feed in Microevolution, or evolution at its the water; therefore they have no smallest scale, occurs when need to fly. The Antarctic home of penguins an individual's traits change is flat and barren; therefore there in response to environmental is no place to fly. factors. Ancestral penguins without large a community of organisms wings were better able to swim changes due to the extinction and feed in the water; therefore they passed their genes for of several dominant species. shorter wings structure onto their a new species arises from an offspring. existing species. Ancestral penguins did not use a population's allele their wings for long periods of frequencies change over a time; therefore penguins today’s span of generations. have only tiny, nonfunctional wings. The cold and wind of Antarctica Allopatric speciation occurs when: make flight impossible; therefore one population of the same species is separated
Contribution to the gene pool of the next generation Genetic variability Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities? By identifying the bones as being homologous structures By the principle of convergent evolution By proposing that humans, bats, and dolphins share a common ancestor A and C only A, B, and C Which of the following is probably the best explanation for the fact that Antarctic penguins cannot fly, although there is evidence that millions of years ago their ancestors could do so? Penguins live on land and feed in the water; therefore they have no need to fly. The Antarctic home of penguins is flat and barren; therefore there is no place to fly. Ancestral penguins without large wings were better able to swim and feed in the water; therefore they passed their genes for shorter wings structure onto their offspring. Ancestral penguins did not use their wings for long periods of time; therefore today’s penguins have only tiny, nonfunctional wings. The cold and wind of Antarctica make flight impossible; therefore penguins that live there have lost the ability to fly. A biologist studies a population of squirrels for 15 years. During this time, the population always remains between 30 – 45 squirrels. His data shows that more than ½ of the squirrels born do not survive to reproduce, due to competition for food and predation. Then, in a single generation, 90% of the squirrels born live to reproduce, and the population increases to 80. Which inference(s) about this population might be true? The amount of available food may have increased. The number of predators may have decreased. The squirrels of subsequent generations should show greater levels of genetic variation than previous generations, because squirrels that would not have survived in the past will now survive. A and B only A, B, and C Microevolution, or evolution at its smallest scale, occurs when an individual's traits change in response to environmental factors. a community of organisms changes due to the extinction of several dominant species. a new species arises from an existing species. a population's allele frequencies change over a span of generations. Allopatric speciation occurs when: one population of the same species is separated
evolution_practice_test_questions_key.docx