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How can DNA be used to estimate how long ago two species shared a common ancestor?
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How would you know if organisms shared a common ancestor?
The closer the DNA pattern (the nucleotide base pairing), the closer the species from a common ancestor.
Two species are classified in the same genus. How does this classification reflect the evolutionary relationship between the two species?
it means the species shared a common ancestor in the recent past
What is phylogenetic relatedness?
Recency of common ancestry. Species A is more closely related to species B than to species C if (and only if) the last common ancestor of A and B lived more recently than the last common ancestor of A and C. The concept can be applied not just to species but also to organism, populations, or genes.
Is it true that the degree of dissimilarity in DNA sequences is an indication of how long ago two species shared a common ancestor?
There is a direct proportional relationship between common ancestry and degree of DNA similarities. The common ancestry will determine the degree of the similarities in the DNA.
If you compare organisms with similar characteristics what indicates recent their common ancestor probably is?
The more similar the two groups are, the most recent the common ancestor probably is.
Species that shared a common ancestor in the recent past have many?
traits
How would you know if organisms shared a common ancestor?
The closer the DNA pattern (the nucleotide base pairing), the closer the species from a common ancestor.
What is generally true of two sibling species?
They shared a common ancestor recently in evolutionary time.
What is the type of trait shared with a common ancestor?
A trait shared with a common ancestor is called an inherited or ancestral trait.
Two species are classified in the same genus. How does this classification reflect the evolutionary relationship between the two species?
it means the species shared a common ancestor in the recent past
What does it mean for species to have an evolutionary relationship?
If two organisms share an evolutionary relationship, that means that they have a common ancestor on the evolutionary tree. The more recently the shared common ancestor lived, the more closely related the two present organisms are, evolutionarily.
What is phylogenetic relatedness?
Recency of common ancestry. Species A is more closely related to species B than to species C if (and only if) the last common ancestor of A and B lived more recently than the last common ancestor of A and C. The concept can be applied not just to species but also to organism, populations, or genes.
In the early 1800s Darwin studied 13 kings of finches what did Darwin hypothesize about these birds?
The finches were different species that shared a common ancestor
What structures have been shared by related species and have been inherited from a common ancestor?
what is Similar structures that related species have inherited from a common ancestor
What trait shared with a common ancestor?
Homologous structures
What is the definition of ancestral trait?
An ancestral trait is a trait that is shared by a group of organisms and their common ancestor. It is a characteristic that has been inherited from a common ancestor and has been passed down through generations without change.
What are the character states shared by the ancestor or outgroup of a clade called?
Character states shared by the ancestor or outgroup of a clade are referred to as plesiomorphies. These are ancestral traits that were present in the common ancestor of a group but are not unique to the members of the clade.
