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strengths and weaknesses of the two Theories of Evolution.Lamarck’s Theory
Ask: strengths and weaknesses of the two Theories of Evolution.
Lamarck’s Theory
Answer:
The strength are obvious. We adapt to our needs. What we use the most becomes more user friendly. What we don’t use is not developed, increasing our efficiency. Lamarckian evolution is mostly a good thing.
One weakness is that traits may stick around long after they are no longer needed. The children of those who were victims of the Dutch famine of 1944, for example, were perfectly adapted for famine, but never experienced it. Thus they suffered from obesity and other issues.
Good or bad, as David said, Neo-Lamarckian adaptation is very real.
Explanation:
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Which of the two theories do you think is more
Ask: Which of the two theories do you think is more factual between lamarck and darwin theory?
Darwin Theory
Explanation:
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what were Lamarck's theories of evolution? briefly explain each theory
Ask: what were Lamarck’s theories of evolution? briefly explain each theory
Answer:
Lamarckism was proposed by Jean-Baptiste de Monet Lamarck in the year 1744-1829. This theory was based on the principle that all the physical changes occurring in an individual during its lifetime are inherited by its offspring. For eg., the development of an organ when used many times. This theory has been explained here.
Lamarck’s Theory
Lamarck’s theory includes four main propositions:
Change Through Use And Disuse
Organisms Driven To Greater Complexity
Inheritance of Acquired Characters
Effect of Environment and New Needs
Examples of Lamarckism
Few of the examples of Lamarckism are mentioned below:
Evolution of giraffe
Aquatic Birds with Webbed Toes
Extinction of Limbs in Snakes
Flightless Birds
Cave Dwellers
Explanation:
Lamarckism was proposed by Jean-Baptiste de Monet Lamarck in the year 1744-1829. This theory was based on the principle that all the physical changes occurring in an individual during its lifetime are inherited by its offspring. For eg., the development of an organ when used many times. This theory has been explained here.
Lamarck’s Theory
Lamarck’s theory includes four main propositions:
Change Through Use And Disuse
The organs which are used frequently by the organism develop and the characteristics that are used seldom are lost in the succeeding generations. For eg., a giraffe stretches its neck to eat leaves, a “nervous fluid” would flow in its neck and it enlarges. The organs which the organisms have stopped using would shrink with time.
Organisms Driven To Greater Complexity
As the organisms adapted to their surroundings, they became increasingly complex from the simpler forms. Lamarck believed in the spontaneous generation of life.
Inheritance of Acquired Characters
An individual acquires certain characteristics during its lifetime. These characters are inherited by their offspring as well. He explained this with an example of a blacksmith. A blacksmith has strong arms due to the nature of their work. He proposed that any children a blacksmith conceives will inherit the development of strong muscles.
Effect of Environment and New Needs
The environment influences all the organisms. A slight change in the environment brings about changes in the organisms. This gives rise to new needs which in turn produces new structures and changes the habits of the organisms.
Examples of Lamarckism
Few of the examples of Lamarckism are mentioned below:
Evolution of giraffe
The ancestors of the giraffe looked like horses with small necks and forelimbs. They lived in areas where there was no surface vegetation. Therefore, they had to stretch their neck and forelimbs to eat leaves from tall plants. Consequently, these parts got elongated. This trait was transmitted in the successive generations.
Aquatic Birds with Webbed Toes
Aquatic birds such as ducks are believed to have evolved from terrestrial animals.
Extinction of Limbs in Snakes
The snakes are believed to have evolved from lizard-like ancestors that have two pairs of limbs.
Flightless Birds
It is believed that the ancestors of birds such as Ostrich were able to fly. Due to some environmental changes, they had a lot of food and were well protected. They stopped using their wings and as a result, the wings became vestigial.
Cave Dwellers
The ancestors of the animals living in caves are believed to have powerful eyesight. Due to living under continuous dark conditions, they lost their power to see.
What Lamarck's theory
Ask: What Lamarck’s theory
Answer:
Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring.
Answer:
Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring. …
Explanation:
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Similarities and difference of two theories lamarckism and mutation
Ask: Similarities and difference of two theories lamarckism and mutation
Answer:
Their theories are different because Lamarck thought that organisms changed out of need and after a change in the environment and Darwin thought organisms changed by chance when they were born and before there was a change in the environment. … They both thought that organisms changed.
what were Lamarck's theories of evolution? briefly explain each theory
Ask: what were Lamarck’s theories of evolution? briefly explain each theory
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Answer:
Jean Baptiste Lamarck (1744-1829) is one of the best-known early evolutionists. Unlike Darwin, Lamarck believed that living things evolved in a continuously upward direction, from dead matter, through simple to more complex forms, toward human “perfection.” Species didn’t die out in extinctions, Lamarck claimed.
Explanation:
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What is the gist of Lamarck's theory?
Ask: What is the gist of Lamarck’s theory?
Answer:
Lamarckism
a theory of evolution based on the principal that physical changes in organisms during their lifetime-such as greater development of an organ or a part through or increased use-could be transmitted to their offspring.
Explanation:
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What is the gist of Lamarck's theory?
Ask: What is the gist of Lamarck’s theory?
Answer:
Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring.
What is the main gist of lamarckism?
– Lamarckism: The theory of acquired characteristics put forth by Jean-Baptiste P.A. Lamarck (1744-1829), a French botanist, zoologist and biological philosopher. According to Lamarck, evolution occurs because organisms can inherit traits acquired by their ancestors. … The basic tenet of Lamarckism has been rejected.
1. what were Lamarck's theories of evolution? briefly explain each
Ask: 1. what were Lamarck’s theories of evolution? briefly explain each theory
2. what was the theory of natural selection all about?
3. how do Lamarck’s giraffes differ from Darwin’s giraffes?
Answer:
1. Jean Baptiste Lamarck (1744-1829) is one of the best-known early evolutionists. Unlike Darwin, Lamarck believed that living things evolved in a continuously upward direction, from dead matter, through simple to more complex forms, toward human “perfection.” Species didn’t die out in extinctions, Lamarck claimed.
2. Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring.
3. According to Darwin’s theory, giraffes that happened to have slightly longer necks and limbs would have a better chance of securing food and thus be able to have more offspring — the “select” who survive. Conversely, in Lamarck’s view, a structure or organ would shrink or disappear if used less or not at all.
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give the two type of theories presented by lamarck
Ask: give the two type of theories presented by lamarck
Answer:
Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring. The doctrine, proposed by the French naturalist Jean-Baptiste Lamarck in 1809, influenced evolutionary thought through most of the 19th century. Lamarckism was discredited by most geneticists after the 1930s, but certain of its ideas continued to be held in the Soviet Union into the mid-20th century.
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