Homologous structures
provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features).
What body structures did the common ancestor have?
Homologous structures
are structures that have a common function and suggest common ancestry. For example, homologous structures include the limbs of mammals, such as bats, lions, whales, and humans, which all have a common ancestor. Different mammals may use their limbs for walking, running, swimming or flying.
Which type of structure suggests a common ancestor?
HOMOLOGOUS STRUCTURES
(definition): similar structures that related organisms share from a common ancestor.
What about these structures supports the theory of evolution?
Structures that have lost their use through evolution are called
vestigial structures
. They provide evidence for evolution because they suggest that an organism changed from using the structure to not using the structure, or using it for a different purpose.
What evidence supports common ancestry between two species select all that apply?
Fossils, anatomy, embryos, and DNA sequences
provide corroborative lines of evidence about common ancestry, with more closely related organisms having more characteristics in common.
What are examples of analogous structures?
Analogy, in biology, similarity of function and superficial resemblance of structures that have different origins. For example,
the wings of a fly, a moth, and a bird
are analogous because they developed independently as adaptations to a common function—flying.
What are the 7 evidences of evolution?
Evidence for evolution:
anatomy, molecular biology, biogeography, fossils, & direct observation
.
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.
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
.
How do you explain natural selection?
Natural selection is the
process through which populations of living organisms adapt and change
. Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others.
What are the evidence for the theory of 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.
What are the 3 main lines of evidence for evolution?
SESSION 3: What Is the Evidence for Evolution? Darwin used multiple lines of evidence to support his theory of evolution by natural selection
— fossil evidence, biogeographical evidence, and anatomical evidence
.
What are the theories of evolution?
The theory of evolution is
based on the idea that all species
?
are related and gradually change over time
. Evolution relies on there being genetic variation
?
in a population which affects the physical characteristics (phenotype) of an organism.
What is the evidence for evolution quizlet?
– The fossil record is
a record of change in a species over time
. – Geologists found that fossil organisms on the bottom, or older, layers were more primitive than those in the upper, or newer, layers. – These findings supported Darwin’s concept of descent with modification.
What are homologous features?
Homologous structures are
similar physical features in organisms that share a common ancestor
, but the features serve completely different functions. An example of homologous structures are the limbs of humans, cats, whales, and bats.
What is the difference between homologous and analogous structures?
Homologous structures
share a similar embryonic origin
; analogous organs have a similar function. For example, the bones in the front flipper of a whale are homologous to the bones in the human arm. … The wings of a butterfly and the wings of a bird are analogous but not homologous.
