Name: Neo-Darwinism- Modern Synthetic Theory of Evolution
Uploaded: 2019-07-19
Duration: 14 min 41 s
Description: Modern synthetic theory of evolution takes Darwin's theory of natural selection and Mendelian genetics into consideration. Emphasis is more on genes. Is it a...

Question

How does Lamarckism explain the evolution of long-necked and long-legged giraffe?

Accepted Answer

According to Lamarck's theory, the modern-day long-necked giraffe evolved from the short-necked and short-legged forms that existed in the past.
The giraffe had to stretch their neck and forelegs in order to reach the higher levels of trees. The longer necks and longer legs produced in each generation were passed on to the next generation.

Over a period of time, after a number of successive generations, the present-day giraffe with long necks and long forelegs were evolved. The present-day forms area result of the continuous effort to reach the leaves of progressively tall trees.
The giraffes became taller and taller due to the accumulation of favourable variations and the short-legged variety completely disappeared.

How does Lamarckism explain the evolution of long-necked and long-legged giraffe?

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