Definitions / Explanation : Analogous organs & Vestigial or rudimentary organs
Definitions / Explanation : Analogous organs & Vestigial or rudimentary organs
They have almost similar appearance and perform the same function but these develop in totally different groups and are totally different in their basic structure and developmental origin e.g. Wings of butterfly (chitinous), bird (feathered), Pterodactyle and bat (skin fold) serve the same purpose of uplifting the body in air but differ in structure.
$=$ They are the useless remnants of structures or organs which might have been large and functional in the ancestors.
- Vermiform appendix in man, nictitaing membrane, auricular muscles vestigial tail in vertebrates, wisdom teeth, mammary glands in males and body hair are some of its examples.
Similar Questions
Match the columns :
Column - $I$
Column - $II$
$(1)$ Charles Darwin
$(a)$ Mutation theory
$(2)$ Lamarck
$(b)$ Germ plasm theory
$(3)$ Hugo de vries
$(c)$ Philosophie zoologique
$(4)$ Ernst Haeckel
$(d)$ The origin of species
$(5)$ August Weismann
$(e)$ Biogenetic law
$(f)$ Eassy on population
Match the columns :
| Column - $I$ | Column - $II$ |
| $(1)$ Charles Darwin | $(a)$ Mutation theory |
| $(2)$ Lamarck | $(b)$ Germ plasm theory |
| $(3)$ Hugo de vries | $(c)$ Philosophie zoologique |
| $(4)$ Ernst Haeckel | $(d)$ The origin of species |
| $(5)$ August Weismann | $(e)$ Biogenetic law |
| $(f)$ Eassy on population |
Definitions / Explanation : Evolution & Theory of species creation
Definitions / Explanation : Evolution & Theory of species creation
Definitions / Explanation : Homology & Adaptive radiation or divergent evolution
Definitions / Explanation : Homology & Adaptive radiation or divergent evolution
$A$ : $A$ single large mutation called saltation can produce new species.
$R$ : Mutations are directional
$A$ : $A$ single large mutation called saltation can produce new species.
$R$ : Mutations are directional
Complete fossil of whose among the following is found
Complete fossil of whose among the following is found