Question
When is evolution by natural selection most likely to occur?
A when there is a stable population of predators
B when there is a stable environment
C when there is less variation in the population
D when there is more variation in the population
Answer/Explanation
D
Evolution by natural selection is most likely to occur when there is more variation in the population. Option D, “when there is more variation in the population,” is the correct answer. Natural selection acts on the heritable variation within a population, favoring traits that provide a reproductive advantage in a given environment. When there is greater variation in a population, there is a larger pool of genetic diversity for natural selection to act upon. This increases the chances that beneficial traits will arise and be selected for, leading to evolutionary change over time.
Question
Which statement about selective breeding is correct?
A The inheritance of alleles is not involved.
B Only individuals better adapted to the environment will survive.
C Individuals are crossed to produce the next generation.
D There is competition for resources
▶️Answer/Explanation
C
The correct statement about selective breeding is C: Individuals are crossed to produce the next generation.
Selective breeding, also known as artificial selection, is a process in which humans intentionally breed plants or animals with specific desirable traits. This is done by selecting individuals with those traits and crossing them to produce offspring that inherit the desired characteristics. Through successive generations of selective breeding, these desired traits can be amplified or refined.
Question
What is not a feature of natural selection?
A competition for resources
B production of many offspring
C selection by humans
D variation within the population
▶️Answer/Explanation
C
The correct answer is C: selection by humans. It is not a feature of natural selection. Natural selection is a natural process that occurs without human intervention. Natural selection acts on heritable variations within a population and favors traits that increase an organism’s fitness for survival and reproduction.
Question
Which statement about selective breeding is correct?
A It does not involve humans.
B It involves a struggle for survival.
C It always involves one parent.
D It involves parents that possess desirable features
▶️Answer/Explanation
C
The correct statement about selective breeding is D: It involves parents that possess desirable features. Selective breeding, also known as artificial selection, is a process in which humans intentionally breed plants or animals with specific desirable traits. In selective breeding, individuals with desirable features or characteristics are chosen as parents for the next generation. The goal is to pass on and amplify those desirable traits in the offspring.
Question
Which statement about selective breeding is correct?
A It does not involve humans.
B It involves a struggle for survival.
C It always involves one parent.
D It involves parents that possess desirable features
▶️Answer/Explanation
D
The correct statement about selective breeding is D: It involves parents that possess desirable features. Selective breeding, also known as artificial selection, is a process in which humans intentionally breed plants or animals with specific desirable traits. In selective breeding, individuals with desirable features or characteristics are chosen as parents for the next generation. The goal is to pass on and amplify those desirable traits in the offspring.