Unit 7 Test - Natural Selection 2023-2024

Front

What is natural selection?

Back

Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.

Front

Define incomplete dominance.

Back

Incomplete dominance is a genetic situation in which one allele does not completely dominate another allele, resulting in a new phenotype that is a blend of the two.

Front

What is an allele?

Back

An allele is a variant form of a gene that can produce different traits.

Front

Explain the concept of fitness in biology.

Back

Fitness refers to an organism's ability to survive and reproduce in its environment.

Front

What is adaptation?

Back

Adaptation is a trait that enhances an organism's ability to survive and reproduce in a specific environment.

Front

How does natural selection affect allele frequencies in a population?

Back

Natural selection can increase the frequency of beneficial alleles and decrease the frequency of harmful alleles over generations.

Front

What is the significance of the H and S alleles in sickle cell anemia?

Back

H represents normal hemoglobin, while S represents the sickle cell allele; the balance of these alleles affects health and survival in different environments.

Front

What is the relationship between adaptation and fitness?

Back

An adaptation is a trait that improves an organism's fitness, allowing it to survive and reproduce more effectively.

Front

How can environmental factors influence natural selection?

Back

Environmental factors, such as pollution or predation, can create pressures that favor certain traits over others, influencing which alleles are passed on.

Front

What evidence supports the theory of natural selection?

Back

Evidence includes observed changes in allele frequencies, survival rates of different phenotypes, and adaptations to environmental changes.