Darwin theory of natural selection

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Reference no: EM133457416

Questions

1. Darwin's theory of natural selection is based on
A. variation in fitness.
B. the inheritance of variation.
C. Natural selection is based on all three of these answers.
D. the struggle for existance.

2. Adaptations:
A. are components of organisms that enable them to survive and reproduce.
B. allow organisms to evolve more rapidly.
C. cannot be passed from parent to offspring.
D. almost always occur by chance alone.

3. As a result of a drought, the average size of a bird's beaks on Daphne Major increased. This is an example of:
A. directional selection
B. stabilizing selection
C. averaging selection
D. disruptive selection

4. Fitness refers to an individual's
A. reproductive success
B. strength
C. age at death
D. aggressiveness

5. Which of the following events on Daphne Major embodied Darwin's postulates?
A. Beak depth varied among the birds of the island.
B. All of these are important for the selection of beak size on Daphne Major
C. The supply of food was not sufficient to feed the entire finch population.
D. Parents and offspring had similar beak depths.

6. When the Grants measured the beaks of the birds on Daphne Major after the drought, they found:
A. beak size is inherited so the next generation had a larger average beak size
B. a large number of the birds had died as a result of the drought
C. the survivors of the drought had a larger average beak size
D. The Grants found all these things as part of their study.

7. The beak size and shape of the finches on Daphne Major
A. never changed because of stasis
B. never changed because of high juvenile mortality
C. changed because equilibrium existed in the population
D. changed over time because of environmental change

8. Most genetic mutations that occur to an organism's DNA are
A. predictable and patterened
B. Adaptive
C. helpful to the organism's survival
D. nonadpative

9. Gametes are:
A. were discovered by Darwin.
B. do not differ between male and female animals
C. the somatic cells of the body.
D. The sex cells or eggs and sperm.

10. Most genetic mutations are
A. neutral, have little observable effect on an organism
B. responsible for superpowers
C. nonadaptive, hurt the organism's ability to survive and reproduce
D. adaptive, help the organism survive and reproduce

11. The phenotype of an individual refers to:
A. its visible characteristics.
B. The number of chromosomes in its body cells.
C. the actual alleles in its chromosomes.
D. the number of chromosomes in its sex cells.

12. How is variation maintained?
A. New variation is slowly added by mutation.
B. There is no blending during sexual reproduction.
C. All of these are ways that genetic variation remains within a population.
D. Mutations can be hidden in the heterozygous genotype.

13. Characters are more likely to exhibit continuous variation when:
A. there are no environmental effects.
B. they are affected by alleles at only one locus.
C. inheritance is blending rather than particulate.
D. they are affected by alleles at many different gene loci.

14. Continuously varying traits:
A are shaped by many genes, each with only a small effect on the phenotype.
B. all of these are important in shaping

C. continuously varying traits can be greatly impacted by the environment during an individual's growth and development.

D. are affected by genes at many loci.

15. What is the only source of new genetic material in any population?
A. migration
B. mutation
C. natural selection
D. genetic drift

Reference no: EM133457416

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