7.12 Variations in Populations

• Variations in populations refer to differences in traits among individuals within the same population
• Genetic mutations introduce new alleles
• Environmental factors can lead to phenotypic variations in populations.


  True
• Steps by which genetic variation allows adaptation to environmental changes:

  1️⃣ Genetic variation exists within the population

  2️⃣ Environmental change occurs

  3️⃣ Individuals with advantageous traits survive

  4️⃣ Advantageous traits are passed on
• Genetic variation ensures long-term resilience and survival in changing environments.


  True
• What is an example of a genetic variation in humans?

  Eye color
• Environmental variations refer to changes in environmental factors
• What environmental factor affects metabolic rates, distribution, and reproductive success?

  Temperature
• Food availability limits population size
• What are environmental variations defined as?

  Changes in environmental factors
• Variations within a population provide the raw material for natural selection
• What is an example of a morphological variation that allows finches to survive effectively?

  Beak size
• Sickle cell carriers have higher survival rates in malaria-endemic areas due to their resistance to the disease.

  True
• What behavioral variation in birds improves their access to food and mating opportunities?

  Migratory patterns
• Populations evolve to better fit their ecological niches
• Match the type of variation with its example:

  Genetic ↔️ Eye color in humans

  Morphological ↔️ Beak size in Darwin's finches

  Physiological ↔️ Lactose tolerance

  Behavioral ↔️ Migratory patterns in birds
• Genetic mutations introduce new alleles and traits
• How can environmental factors lead to phenotypic variations in organisms?

  By affecting their diet
• Genetic variation allows populations to respond to environmental changes by enabling differential survival and reproduction.


  True
• Match the trait with its example and significance:

  Lactose tolerance ↔️ Allows continued milk consumption in adulthood

  Sickle cell resistance ↔️ Reduces risk of malaria

  Beak size in finches ↔️ Enables different food sources
• What is the significance of genetic variation for adaptation?

  Respond to environmental changes
• Why is genetic variation essential for long-term resilience and survival?

  Ensures adaptation and evolution
• Steps in the process of genetic variation leading to adaptation

  1️⃣ Environmental changes occur

  2️⃣ Individuals with advantageous traits survive

  3️⃣ Advantageous traits are passed on

  4️⃣ Genetic makeup of the population shifts
• How does temperature affect a population's metabolic rates and distribution?

  Changes metabolic rates, distribution, and reproductive success
• Environmental variations can lead to adaptations over time as organisms with suitable traits thrive and reproduce.


  True
• Variations within a population are essential for natural selection as they provide the raw material for differential survival and reproduction.

  True
• What are the three main sources of variations within a population?

  Genetic mutations, sexual reproduction, environmental factors
• Natural selection is the mechanism by which populations evolve to better fit their ecological niches.


  True
• Variations in populations are crucial for natural selection.


  True
• What is the role of sexual reproduction in creating variations?

  Genetic recombination
• Genetic variation refers to differences in gene sequences
• Match the trait with its example and significance:

  Lactose tolerance ↔️ Allows milk consumption in adulthood

  Sickle cell resistance ↔️ Reduces malaria risk

  Beak size in finches ↔️ Enables different food sources
• Variations in populations are caused by genetic mutations, sexual reproduction, and environmental factors
• Sources of variation provide the raw material for natural selection.


  True
• Environmental variations can lead to adaptations in populations over time.

  True
• Precipitation determines water availability and influences plant growth and animal hydration.


  True
• What does habitat structure influence in a population?

  Shelter availability and usability
• Environmental variations can lead to adaptations in populations over time.


  True
• What is an example of a genetic variation that provides a nutritional advantage?

  Lactose tolerance
• What are the main causes of variations in populations?

  Genetic mutations, sexual reproduction, environmental factors