Lesson 1: Evolution (chapter 5_Env)

What are genes?

• Genes are a sequence of DNA that code for a particular trait.

• Genes are a type of cell found in animals.

• Genes are a kind of food fish eat.

• Genes are a part of the water in a fish tank.

What does the gene pool refer to?

• All the genes present in a population.

• The place where fish swim.

• The color of a fish’s scales.

• The food that fish eat.

What is biological evolution?

• The change in a population’s gene pool over time.

• The way fish swim in water.

• The process of fish eating food.

• The growth of plants in water.

What do genes control in fish?

• The color and pattern of the fish’s scales.

• The size of the fish’s fins.

• The amount of water in the tank.

• The type of food fish eat.

What is a mutation in biological evolution?

• An accidental change in DNA that can give rise to variation among individuals.

• The movement of individuals into a population.

• The process of photosynthesis in plants.

• The way animals communicate with each other.

What does migration (gene flow) mean in biological evolution?

• Movement of individuals into or out of a population.

• Change in DNA that causes variation.

• The process of cell division.

• The way plants grow towards sunlight.

What is genetic drift?

• The variation in the relative frequency of different genotypes in a small population due to chance

• The process by which organisms adapt to their environment

• The increase in population size over time

• The transfer of genes from one species to another

Genetic drift occurs mainly because:

• Individuals die or do not reproduce by chance

• All individuals reproduce equally

• Genes are transferred intentionally

• Populations always stay the same size

Which of the following is true about genetic drift?

• It occurs by chance

• It is always planned

• It only happens in large populations

• It never affects gene frequency

What is natural selection?

• A process by which traits useful for survival and reproduction are passed on more frequently than those that are not.

• A process by which all traits are passed on equally.

• A process by which only harmful traits are passed on.

• A process by which traits are randomly passed on without any advantage.