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Which of the following theories are related to the evolution of life? A. The theory of natural selection B. Mutation theory of evolution C. Theory of inheritance of acquired characteristics D. Theory of segregation

Which of the following theories are related to the evolution of life? A. The theory of natural selection B. Mutation theory of evolution C. Theory of inheritance of acquired characteristics D. Theory of segregation Correct Answer A, B, and C

The correct answer is A, B and C.

Key Points

  • The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859.
  • It is the process by which organisms change over time as a result of changes in heritable physical or behavioural traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring.
  • Hugo de Vries (1901) put forward a theory of evolution, called mutation theory.
  • The theory states that evolution is a jerky process where new varieties and species are formed by mutations (discontinuous variations) that function as the raw material of evolution.
    • Mutations or discontinuous variations are the raw material of evolution.
    • Mutations appear all of a sudden. They become operational immediately.
    • Unlike Darwin’s continuous variations or fluctuations, mutations do not revolve around the mean or normal character of the species.
    • The same type of mutations can appear in a number of individuals of a species.
    • All mutations are inheritable.
    • Mutations appear in all conceivable directions.
  • Lamarck is best known for his Theory of Inheritance of Acquired Characteristics, first presented in 1801 (Darwin's first book dealing with natural selection was published in 1859)
  • If an organism changes during life in order to adapt to its environment, those changes are passed on to its offspring.
  • Lamarck also said that body parts that are not being used, such as the human appendix and little toes are gradually disappearing. Eventually, people will be born without these parts.
  • Lamarck also believed that evolution happens according to a predetermined plan and that the results have already been decided.
  • The theory of segregation deals with the meiosis (cell division) of human and does not deal with the evolution of life. This theory is given by Mendel.

Related Questions

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