MCQ Bank
It favors the rare phenotype and makes them more common to maintain variation.
- A) Oscillating selection
- B) Negative frequency-dependent selection
- C) Positive frequency-dependent selection
- D) None of these
It acts against only one extreme of phenotypes, causing a shift in distribution toward the other extreme.
- A) Directional Selection
- B) Oscillating
- C) Stabilizing Selection
- D) Disruptive Selection
Enzyme lactate dehydrogenase in mummichog populations in North are better catalyst at ______temperatures.
- A) Moderate
- B) High
- C) Low
- D) None of these
Which of the following reduce genetic variation within a population?
- A) Crossing over
- B) None of these
- C) Mutation
- D) Inbreeding
Female sea star releases about ______eggs each season.
- A) 10 million
- B) 3 million
- C) 5 million
- D) 1 million
It may promote or constrain evolutionary changes.
- A) Natural selection
- B) Genetic drift
- C) Mutation
- D) Gene flow
Sickle cell anemia is _____________ trait.
- A) Heterozygous
- B) none of these
- C) Homozygous recessive
- D) Homozygous dominant
Horses had been present and had become extinct long ago in___________.
- A) N.America
- B) Africa
- C) S.America
- D) Asia
The process of ________is analogous to flipping a coin.
- A) Gene mutation
- B) None of these
- C) Genetic drift
- D) Gene flow
HMS Beagle set sail on December 27, 1831 on a _____year voyage.
- A) 1 year
- B) 5 years
- C) 7 years
- D) 3 years
___________traits become less frequent in a population and eventually are eliminated.
- A) none of these
- B) Adaptive
- C) Maladaptive
- D) High- quality
__________ is measured as reproductive success.
- A) Extinction
- B) Fitness
- C) Parasitism
- D) Predation
Rare phenotype have ____________chances to survive
- A) Higher
- B) No
- C) None of these
- D) Lower
___________change is the main cause of oscillation in selection.
- A) Environmental
- B) None of these
- C) Genotypic
- D) Phenotypic
Galápagos Islands’s tortoises were quite similar to the tortoises on the mainland of_________.
- A) South Africa
- B) North America
- C) North Africa
- D) South America
Increase in frequency of the already common intermediate type occur in___________.
- A) Disruptive selection
- B) All of these
- C) Stabilizing selection
- D) Directional selection
Following are the evidences of the Darwin’s theory of natural selection EXCEPT
- A) Fossil evidences
- B) Galapagos island
- C) Geology
- D) Molecular biology
_________is measured by the number of surviving offspring left in the next generation.
- A) Reproduction
- B) None of these
- C) Competition
- D) Fitness
In some cases, ------------selection favors one phenotype at one time and another phenotype at another time.
- A) Positive frequency-dependent
- B) None of these
- C) Oscillating
- D) Negative frequency-dependent
If it does not exist, natural selection cannot operate.
- A) None of these
- B) Migration
- C) Variation
- D) Predation