6.2.1 Variation

• Continuous variation refers to traits that can take any value within a range
• What is variation in biology?

  Differences in characteristics
• Discontinuous variation results in traits with only a few distinct categories.

  True
• What is genetic variation caused by?

  Differences in DNA
• Environmental variations are heritable.

  False
• Plant height in different soil conditions is an example of environmental variation.
• What is continuous variation in humans?

  Height
• Blood groups in humans are an example of discontinuous variation.
• Environmental variations are heritable.

  False
• What is an example of environmental variation in plants?

  Plant height
• Eye color in humans is an example of an inherited trait.
• What is mutation in biology?

  Alteration in DNA
• Genetic recombination occurs during prophase I of meiosis.


  True
• Match the cause of genetic variation with its effect:

  Mutation ↔️ Introduces new traits

  Sexual reproduction ↔️ Increases diversity

  Genetic recombination ↔️ Creates new gene combinations
• Light exposure is an environmental factor that influences photosynthesis and other light-dependent processes.
• What is the result of environmental factors on individuals with the same genetic makeup?

  Observable differences
• Why is understanding variation important in biology?

  Explains adaptation and evolution
• Variation can be categorized into continuous and discontinuous variation.
• What is an example of continuous variation in humans?

  Height
• Blood groups in humans are an example of discontinuous variation.


  True
• Match the type of variation with its definition:

  Continuous ↔️ Traits that can take any value within a range

  Discontinuous ↔️ Traits with only a few distinct categories
• Genetic variation arises from differences in DNA sequences and is heritable.


  True
• Are environmental variations heritable?

  No
• Plant height in different soils is an example of environmental variation.
• What are inherited traits determined by?

  Genetic makeup
• Scars are examples of acquired traits.


  True
• Genetic recombination involves the exchange of genetic material during meiosis.
• Match the cause of genetic variation with its effect:

  Mutation ↔️ Introduces new traits

  Sexual Reproduction ↔️ Increases diversity

  Genetic Recombination ↔️ Creates new gene combinations
• How does nutrient availability affect environmental variation?

  Affects growth and development
• Plants grown in nutrient-rich soil may be taller due to environmental variation.


  True
• What is an example of discontinuous variation in humans?

  Blood groups
• Environmental variation is the result of differences in the environment that organisms experience
• What is an example of genetic variation in humans?

  Eye color
• Match the type of variation with its example:

  Genetic variation ↔️ Eye color

  Environmental variation ↔️ Plant height
• What is a key characteristic of genetic variations?

  They are heritable
• What causes genetic variation?

  Differences in DNA
• Match the type of trait with its cause:

  Inherited trait ↔️ Genetic makeup

  Acquired trait ↔️ Environmental factors
• What is a scar from an injury an example of?

  Acquired trait
• Sexual reproduction increases genetic diversity through recombination and independent assortment.
• What is the effect of genetic recombination on chromosomes?

  Creates new gene combinations