$A$ : $A$ 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
- 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.
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.
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 ?
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.
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
Definitions / Explanation : Recapitulation theory or Biogenetic law & Palaeontology