Concept explainers
To describe: The assumptions and limitations of the molecular clock.
Concept introduction: It is important to understand the relationship among organisms to explore their evolutionary history. Some genes evolve at a constant rate which will be helpful to get evolutionary information. However, a gene can evolve at different rates depending on the environment they live. The molecular clock is an approach to measure the time of evolutionary change. The calculation of a molecular clock of a gene can be possible through study of fossil records and plotting the evolution rate taken by a gene. The evolution time point will be represented by genetic differences in terms of nucleotides, codons or amino acids.
Want to see the full answer?
Check out a sample textbook solutionChapter 26 Solutions
Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
- Explain briefly the theory that suggests that: Life evolved from chemical substances present in the environment. (If possible answer should be in accordance with NCERT Biology).arrow_forwardExplain how organisms develop adaptations.arrow_forwardConsider the concept of evolution. Give some reasons why it is impossible to evolve perfect organisms through this process.arrow_forward
- List the three major domains of life and the six kingdoms of organisms. Describe the fundamental criteria used in assigning organisms to these divisions.arrow_forwardExplain the relationship between adaptation and theprocess of biological evolution.arrow_forwardDefine evolution, and explain the three natural occurrences that make evolution inevitable.arrow_forward
- What is Evolution of living things ?arrow_forwardWhy is intelligent design (ID) a flawed argument? Select the statement that is FALSE. There is no way through experiments or observations to falsify the hypothesis of an Intelligent Designer. ID assumes that each molecular machinery is built from scratch, which is not true; existing proteins are often re-used. OID and evolution are both valid hypotheses, but over the years we have found more evidence pointing toward evolution. O ID assumes that systems are irreducibly complex, and that individual components cannot be removed, even though several examples exist of 'irreducibly complex' systems being reduced. en 0 3 $ 35 % ^ 6 18 & * 8 9 44 Indoor Playground with wheelsarrow_forwardContrast the reductionist approach with systems biology. How are the two approaches complementary? Which approach is more likely to consider emergent properties?arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning