Like anatomical structures, the structures of the molecules of life reflect descent with modification. Evidence of a common ancestor for all of life is reflected in
the universality of DNA as the genetic material and in the near universality of the genetic code and the machinery of DNA replication and expression
.
Which of these is the strongest evidence that all organisms on Earth evolved from a common ancestor?
Comparing DNA
Darwin could compare only the anatomy and embryos of living things. Today, scientists can compare their DNA.
Similar DNA sequences
are the strongest evidence for evolution from a common ancestor. Look at the diagram in Figure 9.3.
Which of the following most strongly supports the common origin of all life on Earth all organisms _?
| Question Answer | Which of the following pieces of evidence most strongly supports the common origin of all life on Earth? use essentially the same genetic code |
|---|
What is the strongest evidence for evolution?
Perhaps the most persuasive fossil evidence for evolution is
the consistency of the sequence of fossils from early to recent
. Nowhere on Earth do we find, for example, mammals in Devonian (the age of fishes) strata, or human fossils coexisting with dinosaur remains.
Why was DDT considered a silver bullet?
DDT was once considered a “silver bullet” that
would permanently eradicate insect pests
. … All individual insects should have possessed genomes that made them susceptible to DDT.
What is true of natural selection?
Natural selection is
the differential survival and reproduction of individuals due to differences in phenotype
. … Because individuals with certain variants of the trait tend to survive and reproduce more than individuals with other less successful variants, the population evolves.
What is the weakest evidence for evolution?
Illogical Geology
The Weakest Point in the Evolution Theory.
What are the 7 evidences of evolution?
Evidence for evolution:
anatomy, molecular biology, biogeography, fossils, & direct observation
.
What are the 5 evidences of evolution?
Five types of evidence for evolution are discussed in this section:
ancient organism remains, fossil layers, similarities among organisms alive today, similarities in DNA, and similarities of embryos
.
Is evolution a Fact?
Evolution, in this context, is
both a fact and a theory
. It is an incontrovertible fact that organisms have changed, or evolved, during the history of life on Earth. And biologists have identified and investigated mechanisms that can explain the major patterns of change.
Do Humans come from monkeys?
Humans and monkeys are both primates
. But humans are not descended from monkeys or any other primate living today. We do share a common ape ancestor with chimpanzees. … But humans and chimpanzees evolved differently from that same ancestor.
Why do biologists care about phylogenies?
Why do biologist care about phylogenies? Phylogenies
enable biologists to compare organisms and make predictions and inferences based on similarities and differences in traits
. … A phylogenetic tree may portray the evolutionary history of all life forms.
What environment stimulates evolution of drug resistant pathogens?
humans synthesize methicillin and create environments in which bacteria frequently come into contact with methicillin. convergent evolution. What environment stimulates evolution of drug-resistant pathogens?
Both ancestral birds and ancestral mammals shared a common ancestor that was terrestrial
.
How do biologists interpret these similarities?
How do biologists interpret these similarities?
By identifying the bones as being homologous and proposing that humans, bats, and dolphins share a common ancestor
. Ichthyosaurs were aquatic dinosaurs.
What must be true of any organ described as vestigial?
What must be true of any organ that is described as vestigial?
It must be homologous to some feature in an ancestor
. The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions.
Is natural selection a fact?
Explanation: The idea that organisms can evolve by micro and macro evolution is
a fact
. … That natural selection occurs is a fact, that natural selection can cause changes that result in an increase in complexity required by Neo Darwinian Evolution is a theory.
