$A$ : $A$ single large mutation called saltation can produce new species.
$R$ : Mutations are directional

  • A

    Assertion and Reason both are correct and also correct explanation.

  • B

    Assertion and Reason both are correct but not explanation of assertion.

  • C

    Assertion is correct, but Reason is incorrect.

  • D

    Both Assertion and Reason are incorrect.

Similar Questions

Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.

Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

  • [AIIMS 2012]

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.

 

How do you express the meaning of words like race, breed, cultivars or variety ?

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]

Definitions / Explanation : Recapitulation theory or Biogenetic law & Palaeontology