What permits a gene to act as a molecular clock?
C) chimpanzees and humans. … C) chimpanzees and humans. The most important feature that permits a gene to act as a molecular clock is. A) having a large number of base pairs.
What prevents a gene from acting as a molecular clock?
The correct answer is (D) Natural selection. Genes acting as molecular clocks must accumulate changes, or mutations, at a relatively constant rate….
What is molecular clock theory?
The molecular clock hypothesis states that DNA and protein sequences evolve at a rate that is relatively constant over time and among different organisms. … This is of particular value when studying organisms that have left few traces of their biological history in the fossil record, such as flatworms and viruses.
What is used in Cladistics?
In cladistics, the sharing of derived traits is the most important evidence for evolutionary relationships. Organisms with the same derived traits (such as feathers) are grouped in the same clade. A derived trait is not necessarily an entirely new trait. More often it is a modified form of an ancestral trait.
What makes a good molecular clock?
An ideal molecular clock has a number of features: rate constancy through time, rate homogeneity across lineages, taxonomic breadth and applicability, and accessibility of the data. Characters that have evolved at a relatively constant rate are the most suitable for molecular clocks.
Are molecular clocks accurate?
Molecular clocks in general are much more “erratic” than previously thought, and practically useless to keep accurate evolutionary time, the researchers conclude. They attribute this to the vagaries of natural selection, which may at times constrain specific genetic mutations in certain lineages.
What are analogous structures?
Analogous structures are features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature (compare to homologous structures) and which evolved in response to a similar environmental challenge.
Is a gene a pool?
A gene pool is the total genetic diversity found within a population or a species. A large gene pool has extensive genetic diversity and is better able to withstand the challenges posed by environmental stresses.