Gene Flow
Trending Questions
Q.
What is an example of a bottleneck?
Q. The factor that leads to Founder effect in a population is:
- Genetic drift
- Natural selection
- Genetic recombination
- Mutation
Q. ___ is the transfer of alleles or genes from one population to another.
- Gene flow
- Gene migration
- Genetic drift
- Mutation
Q. Which of the following is the consequence of the founder effect?
- Changes in the genetic makeup of an individual
- Reduction of genetic variability in a new colony established by a small isolated group from a large population
- A decrease in the genetic variability of a population due to a natural disaster
- Both a and c
Q. The distance between genes is measured in
- Angstrom
- Map unit
- Dobson unit
- Millimeter
Q.
The spread of genes from one breeding population to another by migration which may result in change in gene frequency is:
Gene frequency
Gene flow
None of these
Genetic drift
Q.
In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non- directional manner?
Mutations
Random drift
Migration
Selection
Q. In rice, chromosome number is 2n = 24. The number of linkage groups in it shall be
- 24
- 23
- 12
- 48
Q. The migration of breeding individuals between populations causes a corresponding
- Genetic drift
- Directional selection
- Natural selection
- Gene flow
Q. 'Dolly' is an example of a
- transgenic cow
- transgenic sheep
- transgenic monkey
- transgenic rat
Q. Genetic drift
- refers to the random change in the gene frequency
- is same as inbreeding
- refers to the change of recessive alleles
- Both b and c
Q. Define gene pool.
Q. The expression of one gene sometimes prevents the expression of another gene at a different chromosome. What is this phenomenon called?
- Polyploidism
- Genetic inhibition
- Telosuppression
- Epistasis
Q. Which mechanism of evolution affects genetic make up of a population?
- Adaptation
- Natural selection
- Genetic drift
- Gene mutation
Q. Which of the following best represents an example of gene flow?
- A tsunami wipes out all but a few members of a sea turtle population that inhabits a beach.
- A group of polar bears migrates from the ice habitat where they live to a nearby forest, where they interbreed with the brown bears.
- A large population of prairie chickens is reduced to small numbers by a virus.
- A small population of white rhinos is reduced to fewer than a dozen individuals by hunters.
- A population of mosquitos becomes resistant to pesticides used to control their numbers.
Q. Concept of genetic drift was introduced by :
- Sewal Wright
- Hardy Wienberg
- Julian Huxley
- C. G. Simpson
Q. When a disruptive selection produced more than one phenotype within the population, it is
- Bottle neck effect
- Founder effect
- Germplasm effect
- Lederberg's effect
Q. Random genetic drift in a population probably results from
- High genetically variable individuals
- Constant low mutation rate
- Interbreeding within this population
- Large population size
Q. Which of the following is the consequence of the founder effect?
- Changes in the genetic makeup of an individual
- Reduction of genetic variability in a new colony established by a small isolated group from a large population
- A decrease in the genetic variability of a population due to a natural disaster
- Both a and c
Q.
What does the term genetic drift mean?
Q. Which of the following is not the characteristic of population?
- Size
- Age distribution
- Density
- Death rate
- Phenotype
Q. Fill up the blanks in the following paragraph by selecting the correct option.
When migration of a section of population to another place and population occurs, __(i)__ change in the original as well as in the new population. New genes/ alleles are added to the __(ii)__ population and these are lost from the __(iii)__ population. There would be a __(iv)__ if this gene migration, happens multiple times. If the same occurs by chance, it is called __(v)__, Sometimes the change in allele frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders and the effect is called __(vi)__.
When migration of a section of population to another place and population occurs, __(i)__ change in the original as well as in the new population. New genes/ alleles are added to the __(ii)__ population and these are lost from the __(iii)__ population. There would be a __(iv)__ if this gene migration, happens multiple times. If the same occurs by chance, it is called __(v)__, Sometimes the change in allele frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders and the effect is called __(vi)__.
- Natural selection, new, old, gene flow, gene frequencies, founder effect
- Gene frequencies, old, new, natural selection, gene flow, bottle neck effect
- Gene frequencies, new, old, gene flow, genetic drift, founder effect
- Mutations, old, new, natural selection, gene flow, bottle-new effect
Q. The migration of breeding individuals between populations causes a corresponding
- Genetic drift
- Directional selection
- Natural selection
- Gene flow
Q. What is meant by genetic drift? What is the notion of genetic drift?
Q. Write a note on "Genetic drift".
Q. Quick change in phenotypes in a small band of colonisers is called
- Genetic bottleneck
- Founder effect
- Genetic drift
- Gene flow
Q. What causes genetic drift?
Q.
When closely placed genes on the same chromosome are inherited together, the phenomenon is known as
- Crossing over
- Multiple allelism
- Gene interaction
- Qualitative inheritance
- Linkage
Q. Genetic drift
- refers to the random change in the gene frequency
- is same as inbreeding
- refers to the change of recessive alleles
- Both b and c
Q. A small isolated population is more likely to undergo speciation than a large population because a small population
- Has a higher mutation rate
- Is more susceptible to gene flow
- Contains, relatively more genetic diversity
- Is more affected by genetic drift and natural selection