Lamarckism, Darwinism, Branching descent, Natural selection.
Answers
Answer:
Branching descent and natural selection are the two key concepts of Darwinian Theory of Evolution.
1. Branching Descent:
a. New species originate from a single common descendant.
b. New species developed became adapted to a new environment through reproductive isolation.
Example- Darwin's finches - varieties of finches arose from grain eaters/Australian marsupials-evolved from common marsupial.
2. Natural Selection:
a. A process in which heritable variations enable better survival of a species to reproduce in large number.
b. The essential variations in the characteristics are passed on from one generation to the next.
c.These variations make them fit to survive in the constantly changing environment.
Example- In an ecosystem, some giraffes have long necks and others have short ones. If something caused low-lying shrubs to die out, the giraffes with short necks would not get enough food. After a few generations, all the giraffes would have long necks.
Answer:
Lamarckism, or Lamarckian inheritance, also known as "Neo-Lamarckism", is the notion that an organism can pass on to its offspring physical characteristics that the parent organism acquired through use or disuse during its lifetime.
Darwinism is a theory of biological evolution developed by the English naturalist Charles Darwin (1809–1882) and others, stating that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce.
Darwin was much influenced by malthus theory which states the population incrases by animals:geometric progression nd food sources increases;arthemitic progression
Branching Descent is one of the two key concepts given by Darwin to explain his Theory of Evolution. It is defined as a process by which new species originate from a single common descent ( i.e. that species)
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations. ... Variation exists within all populations of organisms.
Theory of darwin natural selection does not explain wt exatly evolution is but explains how evolution might have occured in future his tgeory was based on several facts,observations,and inferences,
They are
1: prodigality of production (over production)
2: constancy in population
3; strrugle for existence
4: unvirsal occurance of variations
5. Orgin of species
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