Why are the gene pools of small populations reduced compared to those of larger populations? (1 point)
Responses
inbreeding
lack of advantageous traits
lack of advantageous traits
lack of suitable mates
lack of suitable mates
bottleneck events
Both inbreeding and bottleneck events can reduce the gene pool of small populations compared to larger populations. Inbreeding occurs when individuals mate with close relatives, leading to a reduction in genetic diversity. Bottleneck events occur when a population drastically decreases in size, leading to a loss of genetic variation. Lack of suitable mates can also contribute to a reduced gene pool in small populations.
choose a answer
Inbreeding
In an ecosystem, there are two color varieties within a species of toads: brown and green. Over 50 years, the proportion of the population that is green increases from 20% to 50%. Which statement is the most likely to explain this change? (1 point)
Responses
A disease caused a decrease in the proportion of brown toads.
A disease caused a decrease in the proportion of brown toads.
The environment changed such that green toads can blend into their surroundings better.
The environment changed such that green toads can blend into their surroundings better.
Pollution caused a decrease in the proportion of brown toads.
Pollution caused a decrease in the proportion of brown toads.
The environment changed such that toads that can jump higher into the trees to survive better.
The environment changed such that green toads can blend into their surroundings better.
In an ecosystem where most flowers are long and bell-shaped, there are two varieties of hummingbird: birds with short beaks and birds with long beaks. What is the most likely hummingbird population composition?(1 point)
Responses
only long-beaked hummingbirds
only long-beaked hummingbirds
more short-beaked hummingbirds
more short-beaked hummingbirds
more long-beaked hummingbirds
more long-beaked hummingbirds
only short-beaked hummingbirds
more long-beaked hummingbirds
Consider the following scenario: You are a scientist observing rodents on the Galapagos Islands. You notice that the introduction of new bird of prey has limited the number of rodents. What term best describes the factor that is limiting the number of rodents the environment can support?(1 point)
Responses
fitness
fitness
food supply
food supply
variation
variation
selective pressure
selective pressure
Consider the following scenario: In an aquatic bird population, some birds have long legs. Other birds have short legs. The food supply is minimal. The birds with long legs are able to wade farther into the water where they can find fish. Over time, the birds with long legs become more common. What scientific term best describes this scenario?(1 point)
Responses
natural selection
natural selection
fitness
fitness
mutation
mutation
selective pressures