Definitions / Explanation : Recapitulation theory or Biogenetic law & Palaeontology
 

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This theory says that "Ontogeny recapitulates evolutionary history.

This means an organism repeats its ancestral history during its development.

It is the study of past life based on the fossil records. It furnishes the most direct and most reliable evidence for evolution.

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Evolution is

Definitions / Explanation : Homology & Adaptive radiation or divergent evolution

 

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]

Match the columns :

Column - $I$ Column - $II$
$(1)$ Mutation $(a)$ Change in population allele frequencies due to chance alone.
$(2)$ Gene flow $(b)$ Difference insurvival and reproduction
$(3)$ Natural selection $(c)$ Immigration, emigration change allele frequencies.
$(4)$  Genetic drift $(d)$ Source of new alleles.

 

Identify correct pair