Definitions / Explanation : Homology & Adaptive radiation or divergent evolution
Definitions / Explanation : Homology & Adaptive radiation or divergent evolution
It is the similarity between organs of different animals based on common ancestry or common embryonic origin and built on the same fundamental pattern but perform varied functions and have different appearance e.g. Seal flipper and forelimbs of birds, bat, horse and human look different, perform different functions but exhibit same structural plan.
It represents evolution of new forms in several directions from the common ancestral type (divergence).
Similar Questions
$A$ : During evolution pouched mammals of Australia survived.
$R$ : Due to lack of competition from any other mammal due to continental drift
$A$ : During evolution pouched mammals of Australia survived.
$R$ : Due to lack of competition from any other mammal due to continental drift
Match the following.
Column $- I$
Column $- II$
$(A)$ Lamark
$(p)$ Finch bird
$(B)$ De Vries
$(q)$ Evening primerose
$(C)$ Darwin
$(r)$ Giraffes
$(s)$ Melanic moths
Match the following.
| Column $- I$ | Column $- II$ |
| $(A)$ Lamark | $(p)$ Finch bird |
| $(B)$ De Vries | $(q)$ Evening primerose |
| $(C)$ Darwin | $(r)$ Giraffes |
| $(s)$ Melanic moths |
$A$ : $A$ 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
Given below are four statements $(A-D)$ each with one or two blanks. Select the option which correctly fills up the blanks in two statements. Statements :
$(A)$ Wings of butterfly and birds look alike andare the results of ___$(i)$___ evolution.
$(B)$ Miller showed that $CH_4 , H_2 , NH_3$ and ___$(i)$___ when exposed to electric discharge in a flaskresulted in formation of ___$(ii)$___ .
$(C)$ Vermiform appendix is a ___$(i)$___ organ and an ___$(ii)$___ evidence of evolution.
$(D)$ According to Darwin evolution took placedue to ___$(i)$___ and ___$(ii)$___ of the fittest.
Given below are four statements $(A-D)$ each with one or two blanks. Select the option which correctly fills up the blanks in two statements. Statements :
$(A)$ Wings of butterfly and birds look alike andare the results of ___$(i)$___ evolution.
$(B)$ Miller showed that $CH_4 , H_2 , NH_3$ and ___$(i)$___ when exposed to electric discharge in a flaskresulted in formation of ___$(ii)$___ .
$(C)$ Vermiform appendix is a ___$(i)$___ organ and an ___$(ii)$___ evidence of evolution.
$(D)$ According to Darwin evolution took placedue to ___$(i)$___ and ___$(ii)$___ of the fittest.
- [AIPMT 2010]
How do you express the meaning of words like race, breed, cultivars or variety ?
How do you express the meaning of words like race, breed, cultivars or variety ?