Lesson Worksheet: Variation Science

In this worksheet, we will practice defining variation and distinguishing between variation caused by genes and variation caused by the environment.


Humans show a wide range of variation in the characteristics height and weight. Which of the following is true about height and weight?

  • AHeight and weight are determined by both genes and the environment.
  • BHeight and weight are determined by the environment only.
  • CHeight and weight are determined by genes only.


Many characteristics are affected by both the environment and genetics. Which of the following examples is a characteristic controlled by genetics only?

  • ABlood type
  • BWeight
  • CHeight


What term is given to the variation that is caused by a person’s surroundings or lifestyle?

  • AEnforced
  • BInherited
  • CGenetic
  • DGenerated
  • EEnvironmental


What scientific term is used to describe the features of an organism?

  • AReflection
  • BGenotype
  • CEvolution
  • DIntelligence
  • ECharacteristics


State whether the following statements about variation are true or false.

Differences in characteristics exist between organisms.

  • ATrue
  • BFalse

All individuals of the same species will have exactly the same characteristics.

  • ATrue
  • BFalse


What term is given to the variation that is passed from parent to offspring?

  • AMutated
  • BGenerated
  • CSpecific
  • DInherited
  • EEnvironmental


A student says, “There is more variation between individuals from different species than between individuals of the same species.” Is the student’s statement correct or incorrect?

  • ACorrect
  • BIncorrect


Which of the following is an example of inherited variation in humans?

  • AHaving blue eyes
  • BPlaying many sports
  • CHaving dyed hair
  • DSpeaking more than one language
  • ELiking spicy foods


Variation between organisms is determined partly by genes. Which of the following best defines a gene?

  • AA strand of DNA that is wound and coiled into a condensed structure
  • BA pair of chromosomes that have identical sequences of DNA
  • CA part of the physical appearance of a person (e.g., having blue eyes)
  • DA section of DNA that contains the information needed to produce a characteristic (e.g., hair color)


The picture shows two ring-tailed lemurs. These individuals are members of the same species. What is meant by species?

Two ring-tailed lemurs
  • AA group of organisms that have similar characteristics and can mate to produce fertile offspring
  • BA group of organisms with the same features but are not able to mate
  • CA group of organisms that are genetically identical and can mate to produce infertile offspring
  • DA group of organisms that are genetically very different but live in the same area and eat the same food

Practice Means Progress

Boost your grades with free daily practice questions. Download Nagwa Practice today!

scan me!

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.