Explain with an example for each how the following provides evidences in favour of evolution in organism: (a) Homologous organs (b) Analogous organs (c) Fossils
Answers
Nice Question! ♥
=====================================
The 3 factors that provide evidence in favour of evolution in organism are :
♦ Fossils
♦ Homologous Organs
♦ Analogous Organs
Roles :
♦ Fossils : Fossils are the remains of dead animals & plants of the ancient time that got stuck in rocks. Fossils provide a linkage between existing & pre-existing species. Fossils found closer to the the earth's surface are of complex & recent organisms. As we dig deeper, fossils of simple organisms are obtained. This geographical succession completely agrees with the concept of evolution.
♦ Homologous Organs : Homologous organs have same origin & anatomical structure but perform different functions. Presence of homologous organs among organisms tells that there existed a common ancestor for them from whom this structure was inherited by them. Homologous organs show the closeness of organisms. The more homologous organs they have, more recently they had a common ancestor. Homologous organs exhibit divergent evolution.
Eg : Forelimb of Humans & Wings of Bat
♦ Analogous Organs : Analogous organs have different origin & anatomical structure but have same function. They exhibit convergent evolution. This means that the organisms evolved from a common ancestor long ago which do not have the organ. Analogous organs were independently developed by the organisms after separation from the ancient ancestor. For instance, birds, insects & bats have evolved from an ancient common ancestor without wings. Their wings were developed separately in each lineage after diverging from ancestor.
Eg : Wings of Bat & Wings of Birds
======================================
Hope my answer was helpful... ☺♥
Answer:
Hola
Nice Question
Here's your answer
(a) Homologus organs are defined as the organs which have same structure but different functions. For example: forelimbs of a man and a bird have same structure but they have different functions. This presence of homologus organs provides evidence that they have derived from the same structure and have different functions.
(a) Homologus organs are defined as the organs which have same structure but different functions. For example: forelimbs of a man and a bird have same structure but they have different functions. This presence of homologus organs provides evidence that they have derived from the same structure and have different functions. (b) Analogous organs are the organs of organisms which have different structure of organs but have same functions. For example: wings of an insect and wings of a bird have different type of structure and performs same functions of flying, Those organs, which have different basic structure but have similar appearance and perform similar functions are called analogous organs For example: The wings of an insect and a bird have different structure but they perform the same function of flying. Analogus organs prove that the organism belonging to different ancestors performs similar functions and they keeps evolving with environment favorable conditions.
(a) Homologus organs are defined as the organs which have same structure but different functions. For example: forelimbs of a man and a bird have same structure but they have different functions. This presence of homologus organs provides evidence that they have derived from the same structure and have different functions. (b) Analogous organs are the organs of organisms which have different structure of organs but have same functions. For example: wings of an insect and wings of a bird have different type of structure and performs same functions of flying, Those organs, which have different basic structure but have similar appearance and perform similar functions are called analogous organs For example: The wings of an insect and a bird have different structure but they perform the same function of flying. Analogus organs prove that the organism belonging to different ancestors performs similar functions and they keeps evolving with environment favorable conditions.(c) Fossils are defined as the dead remains of plants and animals that lived in remote past. The remains of dead animal or plants that lived in the remote past are known as fossils. The presence of fossils proves the evolution. The example of Fossil is: A bird Archaeopteryx has many characteristics of reptiles and seems to be evolved from reptiles.
Hope this helped you. ♥
