Q. No.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
The bones of forelimbs of whales, bats, cheetahs, and men are similar in structure, because:
| 1. | one organism has given rise to another |
| 2. | they share a common ancestor |
| 3. | they perform the same function |
| 4. | they have biochemical similarities |
The appearance of antibiotic-resistant bacteria is an example of:
1. adaptive radiation
2. transduction
3. pre-existing variation in the population
4. divergent evolution
The most accepted line of descent in human evolution is:
| 1. | Australopithecus → Ramapithecus → Homo sapiens → Homo habilis |
| 2. | Homo erectus → Homo habilis → Homo sapiens |
| 3. | Ramapithecus → Homo habilis → Homo erectus → Homo sapiens |
| 4. | Australopithecus → Ramapithecus → Homo erectus → Homo habilis → Homo sapiens. |
Variations during mutations of meiotic recombinations are:
1. random and directionless
2. random and directional
3. small and directional
4. random, small and directional
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. |
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 |
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
Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
| 1. | Overproduction, variations, constancy of population size, natural selection |
| 2. | Variations, constancy of population size, overproduction, natural selection |
| 3. | Overproduction, constancy of population size, variations, natural selections |
| 4. | Variations, natural selection, overproduction, constancy of population size |
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