Biology JAMB

Theories Of Evolution

Aperçu

Evolution, a fundamental concept in Biology, is the process through which living organisms have changed over time, leading to the vast diversity of forms, structures, and functions seen in the world today. It is the driving force behind the adaptation of species to their environment, ensuring their survival and reproduction in changing conditions.

Lamarck's Theory of Evolution proposed by the French biologist Jean-Baptiste Lamarck in the early 19th century suggested that organisms could pass on acquired traits to their offspring. According to Lamarck, if an organism used a particular trait extensively, it would develop and pass it onto its progeny. This theory emphasized the influence of the environment on an organism's evolution.

Darwin's Theory of Evolution, brought to light by Charles Darwin in the mid-19th century, introduced the concept of natural selection as the main mechanism driving evolution. Darwin proposed that organisms with advantageous traits for survival and reproduction would be more likely to pass on their genes to future generations, leading to the gradual change and adaptation of species over time.

The Organic Theory of Evolution views evolution as a continuous and ongoing process, with all living organisms sharing a common ancestry. This theory highlights the interconnectedness of species and the gradual modifications that have occurred over millions of years, resulting in the wide array of life forms present today.

Evidences supporting organic evolution include fossil records showing transitional forms of species, comparative anatomy revealing similarities in structure among different organisms indicating shared ancestry, molecular biology demonstrating genetic similarities across species, and biogeography illustrating the distribution patterns of species around the world.

By understanding the concept of organic evolution, delving into Lamarck's and Darwin's theories, exploring the organic theory of evolution, and identifying the compelling evidence supporting evolution, we gain profound insights into the mechanisms shaping the diversity of life on Earth.

Objectifs

  1. Explore the organic theory of evolution
  2. Examine Lamarck's theory of evolution
  3. Analyze Darwin's theory of evolution
  4. Understand the concept of organic evolution
  5. Identify evidences supporting organic evolution

Note de cours

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  1. Relate organic evolution as the sum total of all adaptive changes that have taken place over a long period of time resulting in the diversity of forms, structures and functions among organisms. Examine the contributions of Lamarck and Darwin to the theory of evolution. Know evidences in support of organic evolution. Question: Which scientist proposed the theory of evolution based on the inheritance of acquired characteristics? A. Charles Darwin B. Gregor Mendel C. Jean-Baptiste Lamarck D. Alfred Russel Wallace Answer: C. Jean-Baptiste Lamarck
  2. Question: Who proposed the theory of evolution through natural selection? A. Charles Darwin B. Gregor Mendel C. Jean-Baptiste Lamarck D. Alfred Russel Wallace Answer: A. Charles Darwin
  3. Question: Lamarck's theory of evolution is also known as: A. Theory of Acquired Inheritance B. Theory of Natural Selection C. Theory of Spontaneous Generation D. Theory of Intelligent Design Answer: A. Theory of Acquired Inheritance
  4. Question: According to Lamarck, in the theory of evolution, changes acquired during an organism's lifetime are passed on to: A. Offspring B. Siblings C. Parental generation D. Unrelated organisms Answer: A. Offspring
  5. Question: Darwin's theory of evolution is based on the principle of: A. Inheritance of acquired characteristics B. Spontaneous generation C. Survival of the fittest D. Constant unchanging species Answer: C. Survival of the fittest
  6. Question: Which concept proposed by Darwin refers to the process where individuals with beneficial traits are more likely to survive and reproduce? A. Natural selection B. Artificial selection C. Genetic drift D. Mutation Answer: A. Natural selection
  7. Question: The theory of evolution based on the idea that all species are related and gradually change over time is known as: A. Lamarck's Theory B. Darwin's Theory C. Organic Theory D. Intelligent Design Theory Answer: C. Organic Theory
  8. Question: Fossil records, anatomical similarities, and embryological evidence are types of: A. Lamarck's acquired characteristics B. Darwin's natural selection C. Evidence supporting organic evolution D. Genetic drift Answer: C. Evidence supporting organic evolution
  9. Question: Which of the following is NOT an evidence supporting organic evolution? A. Molecular Biology B. Homologous Structures C. Vestigial Organs D. Theory of Spontaneous Generation Answer: D. Theory of Spontaneous Generation
  10. Question: The process of organic evolution results in: A. Decreased diversity among organisms B. Unchanging species over time C. Increased diversity of forms and functions D. Instantaneous adaptation to the environment Answer: C. Increased diversity of forms and functions

Livres recommandés

On the Origin of Species
On the Origin of Species
Sous-titre: By Means of Natural Selection
Éditeur: Penguin Classics
Année: 1859
ISBN: 9780140432059
The Descent of Man
The Descent of Man
Sous-titre: And Selection in Relation to Sex
Éditeur: Oxford University Press
Année: 1871
ISBN: 9780199555923
Evolution in Four Dimensions
Evolution in Four Dimensions
Sous-titre: Genetic, Epigenetic, Behavioral, and Symbolic Variation in the History of Life
Éditeur: A Bradford Book
Année: 2005
ISBN: 9780262582659

Questions de révision

Vous vous demandez à quoi ressemblent les questions passées sur ce sujet ? Voici plusieurs questions sur Theories Of Evolution des années précédentes.

WAEC SSCE - Biology - 2021

Question 1 Rapport

Which of the following statements is not Lamarck's postulate on evolution?

Détails de la réponse
The statement that is not Lamarck's postulate on evolution is "survivors in a competitive community must have inherited useful traits." Lamarck's theory of evolution, also known as Lamarckism, proposed that organisms can change during their lifetime by adapting to their environment and that these changes can be passed down to their offspring. This idea is often summarized in the phrase "use it or lose it," which means that organs that are used frequently become stronger and better developed, while those that are not used may become vestigial or disappear altogether. Lamarck also believed that the changes an organism acquired during its lifetime could be passed down to its offspring, which is known as the inheritance of acquired characteristics. For example, if a giraffe stretched its neck to reach high branches and kept doing so throughout its life, it would develop a longer neck and pass this trait down to its offspring. Lamarck did not, however, explicitly state that survivors in a competitive community must have inherited useful traits. This idea is more closely associated with Darwin's theory of natural selection, which suggests that organisms with advantageous traits are more likely to survive and reproduce, passing these traits on to their offspring.
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JAMB UTME - Biology - 2024

Question 1 Rapport

Comparative anatomy to study evidence for evolution depends on
Détails de la réponse

**Comparative anatomy** involves studying the similarities and differences in the anatomy of different species. One of its main purposes in understanding **evolution** is to trace how organisms are related through common ancestry. When we look at the limbs of different animals, some specific features provide essential evidence for evolution.


A key feature often examined is the structure of the limbs of vertebrates, which have evolved to adapt to different environments and modes of living, but share a basic underlying structure. This shared structure is often referred to as the **pentadactyl limb** pattern. The term "pentadactyl" means **five-fingered** or having five digits.


In many vertebrates like humans, whales, bats, and so forth, this **five-fingered** limb structure can be observed, although it has evolved to perform different functions in each species. For example, a human hand, a bat's wing, and a whale's flipper all have the same basic arrangement of bones. This points to the fact that these species share a **common ancestor** and have evolved differently as they adapted to their environments.


Thus, comparative anatomy's focus on the **five-fingered** pattern in limbs is crucial as it provides **evidence** of evolutionary relationships among diverse species, illustrating how they have evolved from a shared ancestry.

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NECO SSCE - Biology - 2004

Question 1 Rapport

Under secretion of thyroxine before maturity cause
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