Post Video Test - EvolutionContact Number: 8527521718Post Video Test - EvolutionContact Number: 8527521718Natural selection operates on the _______ of an individual organism.
| 1. | survival | 2. | environment |
| 3. | genotype | 4. | phenotype |
Stabilizing selection acts to _________ in a species' population.
1. elaborate new traits
2. alter traits
3. push for directional change
4. maintain a certain phenotype
Gene flow is :
| 1. | the emergence of new species from pre-existing species |
| 2. | the exchange of genes during fertilization |
| 3. | mating between close relatives |
| 4. | the movement of genes between species populations |
Genetic drift is :
| 1. | random changes in gene frequency in a population |
| 2. | generational fluctuations in gene frequencies that produce no effect |
| 3. | changes due to interbreeding with other species populations |
| 4. | the effect of mutations as they spread through neighbouring populations |
Genetic drift is most powerful in
1. changing environments
2. small populations
3. large populations
4. stable environments
The concept of genetic bottlenecks includes which of the following?
| 1. | a loss of genetic diversity in descendent populations |
| 2. | extensive gene flow |
| 3. | sharing of genetic material between two populations |
| 4. | increased ability to resist new diseases |
Which statement most accurately reflects what population geneticists refer to as "fitness"?
| 1. | Fitness is the measure of an organism's adaptability to various habitats. |
| 2. | Fitness reflects the number of mates each individual in the population selects. |
| 3. | Fitness refers to the relative health of each individual in the population. |
| 4. | Fitness is a measure of the contribution of a genotype to the gene pool of the next generation. |
Organisms that are least likely to experience extinction over the long term are most likely to be found in:
| 1. | areas inhabited by humans | 2. | very stable habitats |
| 3. | desert | 4. | savanna |
Which one of the following would cause the Hardy-Weinberg principle to be inaccurate?
| 1. | The size of the population is very large. |
| 2. | Individuals mate with one another at random. |
| 3. | Natural selection is present. |
| 4. | There is no source of new copies of alleles from outside the population. |
Which one of the following populations would most quickly lead to two groups with few shared traits?
| 1. | a population with disruptive selection |
| 2. | a population with directional selection |
| 3. | a population with stabilizing selection |
| 4. | a population with no selection |