Consider the following scenario:
A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two groups of birds in the population that differ in leg length and diet. Long-legged birds eat fish, while short-legged birds eat insects. The drought has little effect on insect populations.
What is the main selective pressure in this scenario?
A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two groups of birds in the population that differ in leg length and diet. Long-legged birds eat fish, while short-legged birds eat insects. The drought has little effect on insect populations.
What is the main selective pressure in this scenario?
(1 point)
Responses
insect population
insect population
fish population
fish population
leg length
leg length
drought
availability of food
Consider the following scenario:
A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two groups of birds in the population that differ in leg length and diet. Long-legged birds eat fish, while short-legged birds eat insects. The drought has little effect on insect populations.
What is the main selective pressure in this scenario?
(1 point)
Responses
insect population
insect population
fish population
fish population
leg length
leg length
drought
availability of food
is not a option Consider the following scenario:
A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two groups of birds in the population that differ in leg length and diet. Long-legged birds eat fish, while short-legged birds eat insects. The drought has little effect on insect populations.
What is the main selective pressure in this scenario?
(1 point)
Responses
insect population
insect population
fish population
fish population
leg length
leg length
drought
Which statement is accurate about variations?(1 point)
Responses
In all cases, variations affect how likely it is that an organism reproduces.
In all cases, variations affect how likely it is that an organism reproduces.
Organisms with variations are less likely to pass these variations to their offspring.
Organisms with variations, , are less likely, , to pass these variations to their offspring.
Organisms with variations that give an advantage are more likely to survive.
Organisms with variations that give an advantage are more likely to survive.
In all cases, variations become more common in a population
Organisms with variations that give an advantage are more likely to survive.
Consider the following scenario:
In a muddy lake environment, some fish have brown scales. Most fish, however, have silver scales. Predators have a harder time seeing the fish with brown scales.
Which term best describes the brown scales?
(1 point)
Responses
inactivated gene
inactivated gene
advantageous trait
advantageous trait
predominant phenotype
predominant phenotype
new mutation
advantageous trait
How did the Industrial Revolution impact the population of peppered moths in Britain? (1 point)
Responses
The dark-colored moths became more common.
The dark-colored moths became more common.
The light-colored moths became more common.
The light-colored moths became more common.
The Industrial Revolution caused the proportions of each color morph in the population to become equal.
The Industrial Revolution caused the proportions of each color morph in the population to become equal.
The Industrial Revolution caused the proportions of each color morph in the population to become unequal.