Biology End of Course

Charles Darwin came up with this theory 

• Natural Selection

• Mutation

Answer explanation

Charles Darwin is credited with developing the theory of Natural Selection, which explains how species evolve over time based on the survival of the fittest individuals.

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What is an adaptation?

• A temporary change in an organism's behavior

• A genetic trait that improves an organism's ability to survive and reproduce

• The process by which a species splits into two or more species

• A random change in the DNA of an organism

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What is selective pressure?

• The pressure an organism feels to physically change its body shape to fit into its environment.

• A consistent, directional force of natural selection that leads to a change in allele frequency within a population.

• The social pressure within a population to select the best mates.

• A measure of the amount of rainfall an area receives, influencing vegetation and, consequently, herbivore populations.

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Which of the following best describes the concept of "survival of the fittest"?

• The strongest and largest individuals in a population will survive.

• Only the fastest individuals in a population will reproduce.

• Individuals that are best adapted to their environment are more likely to survive and reproduce.

• Survival is random and not influenced by physical traits or behaviors.

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Which of the following mechanisms is primarily responsible for the introduction of new alleles into a population's gene pool?

• Genetic drift

• Gene flow

• Natural selection

• Mutation

What is the molecule called that carries genetic information?

• Protein

• Carbohydrate

• DNA

• Lipid

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What is the phenotype ratio of a dihybrid cross (AaBb x AaBb) assuming complete dominance?

• 9:3:3:1

• 3:1

• 1:2:1

• 1:1:1:1

What enzyme is primarily responsible for adding nucleotides to a new DNA strand during replication?

• Helicase

• DNA polymerase

• Ligase

• RNA polymerase

Replicate the following strand of DNA: 
AATCATGGA

• AATCATGGA

• TTAGTACCT

• UUAGUACCU

• GGATAUCUA

Which letter in the picture below depicts the replication fork in DNA replication?

• A

• C

• B

• None of the above