SB6

Front

What is the significance of fossils in understanding Earth's history?

Back

Fossils provide evidence of past life forms and their environments, helping scientists reconstruct the history of life on Earth.

Front

Define 'allele' in the context of genetics.

Back

An allele is a variant form of a gene that can result in different traits, such as color or size.

Front

What does the Hardy-Weinberg principle state about genetic equilibrium?

Back

The Hardy-Weinberg principle states that allele frequencies in a population remain constant from generation to generation in the absence of evolutionary influences.

Front

Explain natural selection in simple terms.

Back

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

Front

What is a common ancestor in evolutionary biology?

Back

A common ancestor is a species from which two or more different species have evolved.

Front

What does it mean for a species to be biologically resistant?

Back

A biologically resistant species can survive despite environmental changes or threats, such as diseases or predators.

Front

How do environmental changes affect allele frequencies in a population?

Back

Environmental changes can lead to natural selection, which alters allele frequencies as certain traits become more advantageous.

Front

What is the role of genetic variation in evolution?

Back

Genetic variation provides the raw material for natural selection, allowing populations to adapt to changing environments.

Front

Define 'recessive allele'.

Back

A recessive allele is an allele that only expresses its trait when two copies are present (homozygous).

Front

What is the difference between dominant and recessive traits?

Back

Dominant traits are expressed when at least one dominant allele is present, while recessive traits require two recessive alleles to be expressed.