Understanding Variation: Genetic and Environmental Factors

The video tutorial explains variation within populations, highlighting genetic and environmental causes. Genetic variation arises from inherited genes and mutations, while environmental variation results from living conditions. The tutorial also covers continuous and discontinuous variation, emphasizing how characteristics are influenced by both genes and the environment. It concludes with a summary of these concepts.

What is one of the main causes of genetic variation within a population?

• Environmental changes

• Inherited genes

• Dietary habits

• Physical exercise

How do most genetic mutations affect an organism's phenotype?

• They always cause significant changes

• They have no effect

• They are always beneficial

• They lead to immediate extinction

Which of the following is an example of an acquired characteristic?

• Sun tan

• Height

• Blood type

• Eye color

Why are acquired characteristics not passed on to offspring?

• They are environmentally induced

• They are only temporary

• They are too complex

• They are not encoded in DNA

What determines most characteristics in an individual?

• Only genes

• Only the environment

• Random chance

• A combination of genes and the environment

What type of variation results in a range of phenotypes between two extremes?

• Discontinuous variation

• Environmental variation

• Continuous variation

• Genetic variation

Which type of variation is usually caused by genes only?

• Acquired variation

• Discontinuous variation

• Continuous variation

• Environmental variation