185126
"A brief reduction in size of a population due to natural calamities usually leads to random genetic drift." For this statement, identify the correct example from the following
1 human population of Pitcaim Island
2 polydactylic dwarfs in Amish population
3 long necked giraffe
4 industrial melanism
Explanation:
The variation that occurs by change in a small population are collectively called random genetic drift. It is of two type i.e. Founder effect and bottle neck effect. Bottle neck effects are natural calamities like earthquakes, floods, tsunamis etc. Ex. poly dactylic dwarf individuals are more in old order Amish population of Lancaster in USA.
AP EAMCET-2008
Evolution
185128
The Hardy-Weinberg principle cannot operate if
1 the population is very large
2 frequent mutations occur in the population
3 the population has no chance of interaction with other populations
4 free interbreeding occurs among all members of the population
Explanation:
The Hardy- Weinberg principle can't operate if frequent mutations occurs in population. The HardyWeinberg principle states that allele frequencies in a population will remain constant over time in the absence of evolutionary forces. Theses evolutionary forces include mutation, migration, natural selection and generic drift. Mutation is the only factor listed that can change allele frequencies in a population without the influence of other evolutionary forces.
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Evolution
185126
"A brief reduction in size of a population due to natural calamities usually leads to random genetic drift." For this statement, identify the correct example from the following
1 human population of Pitcaim Island
2 polydactylic dwarfs in Amish population
3 long necked giraffe
4 industrial melanism
Explanation:
The variation that occurs by change in a small population are collectively called random genetic drift. It is of two type i.e. Founder effect and bottle neck effect. Bottle neck effects are natural calamities like earthquakes, floods, tsunamis etc. Ex. poly dactylic dwarf individuals are more in old order Amish population of Lancaster in USA.
AP EAMCET-2008
Evolution
185128
The Hardy-Weinberg principle cannot operate if
1 the population is very large
2 frequent mutations occur in the population
3 the population has no chance of interaction with other populations
4 free interbreeding occurs among all members of the population
Explanation:
The Hardy- Weinberg principle can't operate if frequent mutations occurs in population. The HardyWeinberg principle states that allele frequencies in a population will remain constant over time in the absence of evolutionary forces. Theses evolutionary forces include mutation, migration, natural selection and generic drift. Mutation is the only factor listed that can change allele frequencies in a population without the influence of other evolutionary forces.