Of the ways that populations can evolve over time, __________ is the only mechanism in which the environment selects for better adapted individuals whereas __________ selects traits by random chance.(1 point)
Responses
genetic drift; natural selection
genetic drift; natural selection
natural selection; genetic drift
natural selection; genetic drift
genetic drift; gene flow
genetic drift; gene flow
gene flow; natural selection
natural selection; genetic drift
Biological evolution is defined as a change in the __________ of a species over time.(1 point)
Responses
number of offspring
number of offspring
genetic makeup
genetic makeup
number of individuals
number of individuals
survival rate
genetic makeup
Which piece of evidence best supports the hypothesis that the evolution of altruistic behavior is driven by kin selection?(1 point)
Responses
A meerkat protects the offspring of its sister from an attack by hawks.
A meerkat protects the offspring of its sister from an attack by hawks.
A hippo is observed saving an antelope from an attack by an alligator.
A hippo is observed saving an antelope from an attack by an alligator.
A cuckoo bird hides its own eggs in the nest of another bird species.
A cuckoo bird hides its own eggs in the nest of another bird species.
A male gorilla helps protect his offspring from an attack by a tiger.
A meerkat protects the offspring of its sister from an attack by hawks.
Pandas have become specifically adapted to bamboo forests because they depend on the bamboo for food. Pandas also have a very slow reproduction rate. Females are only capable of becoming pregnant during a 24-to-72-hour window once per year, and they typically only give birth to one cub in the wild. Based on this information, if a major environmental catastrophe like a volcanic eruption or meteor strike destroyed all bamboo forests within the panda ecosystem, what will most likely happen to the panda species?(1 point)
Responses
The species will migrate to a different location that has more bamboo to eat.
The species will migrate to a different location that has more bamboo to eat.
The species will evolve adaptations to eat another food source that is plentiful.
The species will evolve adaptations to eat another food source that is plentiful.
The species will evolve into a new species that is capable of eating new food.
The species will evolve into a new species that is capable of eating new food.
The species will become extinct since it cannot adapt to the changes fast enough.
The species will become extinct since it cannot adapt to the changes fast enough.
Skip to navigation
The species will become extinct since it cannot adapt to the changes fast enough.
What must be true about the population in order for evolution by natural selection to take place?(1 point)
Responses
The population must have a large number of individuals that can reproduce and produce fertile offspring.
The population must have a large number of individuals that can reproduce and produce fertile offspring.
The population must have well camouflaged individuals to avoid being eaten by predators.
The population must have well camouflaged individuals to avoid being eaten by predators.
The population must have strong individuals capable of fighting off other populations when threatened.
The population must have strong individuals capable of fighting off other populations when threatened.
The population must have genetic variation that leads to differential survival and reproduction.
The population must have genetic variation that leads to differential survival and reproduction.
What is a specific example of competitive advantage exhibited by Darwin’s finches?(1 point)
Responses
All of the finches evolved from one ancestral species and adapted to their specific niche.
All of the finches evolved from one ancestral species and adapted to their specific niche.
Birds have one of two forms of the HMGA2 gene.
Birds have one of two forms of the HMGA2 gene.
Female finches mated with males that had similar-sized beaks.
Female finches mated with males that had similar-sized beaks.
Medium ground finches with small beaks survived multiple drought