Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

question
Asked by sweetynam | 18 Feb, 2009, 11:22: PM
Expert Answer

i) Natural selection - Within populations, the inherited traits of some individuals make them more able to survive and reproduce than others under certain environmental conditions. As a result of the environment's selection against nonadaptive traits, only individuals with adaptive traits live long enough to transmit traits to the next generation. Individuals with adaptive traits are more likely to reproduce and increase the frequency of adaptive alleles in the population. Over time, natural selection can change the characteristics of populations.

ii) Genetic drift - Accidents in small populations can change the frequency of some genes in a population, even if they give no survival advantage. This is the notion of genetic drift, which provides diversity without any adaptations.

iii) Mutation - Mutations introduce new alleles (new traits) into a population by altering old alleles.

iv) Gene flow - When migration of a section of population to another place and population occurs, gene frequencies change in the original as well as in the new population. New genes or alleles are added to the new population and these are lost from the old population. There would be a gene flow if this gene migration happens multiple times.

Answered by | 24 Feb, 2009, 07:36: PM
CBSE 10 - Biology
Asked by blessybhatia09 | 17 Apr, 2022, 10:47: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by srestasingh7 | 26 Dec, 2021, 10:36: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by aaazwasi | 25 Jun, 2021, 12:23: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by mohammedfarees405 | 11 Apr, 2021, 11:21: AM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by bhadouriarakesh9917 | 02 Mar, 2021, 08:44: AM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by abhay2006ji | 22 Dec, 2020, 03:46: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by s.saumya1011 | 16 Dec, 2020, 11:09: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by hauryaneeshu | 06 Dec, 2020, 01:36: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by surendravishnoipd10 | 30 Nov, 2020, 08:05: PM
ANSWERED BY EXPERT
CBSE 10 - Biology
Asked by bhumichoudhary9091 | 11 Nov, 2020, 12:10: PM
ANSWERED BY EXPERT
Season Break Offer!
Get 60% Flat off instantly.
Avail Now
×