Explanation: The DNA sequence is more similar in more closely related organisms which shows that they shares a common ancestor. This means that closely related organisms are descended from a common ancestor who over time evolved and modified due to the dissimilar environmental condition and challenges.
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What is the fact that DNA sequences are more similar and more closely related organisms evidence of?
Similar DNA sequences are the strongest evidence for evolution from a common ancestor. Look at the diagram in Figure 9.3. 5. The diagram is a cladogram, a branching diagram showing related organisms.
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Why are similarities in DNA sequences?
The similarities of DNA sequences were used to learn their biological function and evolutionary information; accordingly, their similarities would be represented by their biological mechanism; however, how to reasonably take the biological properties and chemical properties into consideration is another problem.
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What are similar DNA sequences in genes possibly evidence of?
Answer and Explanation: Similar DNA sequences in genes can be evidence of C) Common ancestry. All organisms have evolved from a common ancestor due to the accumulation of variations.
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What does similar DNA sequences between two species indicate?
Finding the same DNA sequence in two different species can indicate a shared common ancestor between the two species. This is because having similar DNA sequences is an example of homology. The more the DNA sequences match up, the more closely related the two species are.
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Will closely related organisms have DNA that is more similar or different?
Answer and Explanation: The DNA of two closely related organisms will be more similar than the DNA of two distantly related organisms.
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How are DNA sequences used to determine how closely related organisms are?
Molecular clocks are used to determine how closely two species are related by calculating the number of differences between the species’ DNA sequences or amino acid sequences. These clocks are sometimes called gene clocks or evolutionary clocks.
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What can the similarity of DNA sequences tell you about relatedness of species?
Similar anatomy found in different species may be homologous (shared due to ancestry) or analogous (shared due to similar selective pressures). Molecular similarities provide evidence for the shared ancestry of life. DNA sequence comparisons can show how different species are related.
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How are DNA protein sequences evidence of evolution?
That two species and their common ancestor have similar DNA is strong evidence supporting evolution. Protein amino acid sequences can also be used to compare similarities between species. Proteins are made from amino acids and the sequence of these amino acids is controlled by genes.
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What are similar DNA sequences in genes evidence of?
Answer and Explanation: Similar DNA sequences in genes can be evidence of C) Common ancestry. All organisms have evolved from a common ancestor due to the accumulation of variations.
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What are similar genes in different organisms evidence of?
These shared genes are evidence of evolution from a common ancestor and the relatedness of all life on Earth. The shared genes are called homologous genes, or genes which share a common ancestry either between or within species.
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What does similar DNA sequences between two species indicate?
Finding the same DNA sequence in two different species can indicate a shared common ancestor between the two species. This is because having similar DNA sequences is an example of homology. The more the DNA sequences match up, the more closely related the two species are.
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What can the comparison of DNA sequences be used to identify?
By comparing the sequences of genomes of different organisms, researchers can understand what, at the molecular level, distinguishes different life forms from each other.
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What is similarity in DNA sequences?
Similarity analysis of DNA sequence is a process to compare unknown DNA sequences with known ones for inferring the functions of unknown ones [7]; it also can provide evolutionary information of the same gene sequence in different species, which is basic approach to comprehend the biological information in DNA sequence …
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Why is it important to compare DNA sequences?
Identifying DNA sequences that have been “conserved” – that is, preserved in many different organisms over millions of years – is an important step toward understanding the genome itself. It pinpoints genes that are essential to life and highlights genomic signals that control gene function across many species.
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What does it mean if two species have similar DNA sequences?
Finding the same DNA sequence in two different species can indicate a shared common ancestor between the two species. This is because having similar DNA sequences is an example of homology. The more the DNA sequences match up, the more closely related the two species are.
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What is similarity between two sequences?
Similarity: Degree of likeness between two sequences, usually expressed as a percentage of similar (or identical) residues over a given length of the alignment. Can usually be easily calculated. Homology: Statement about common evolutionary ancestry of two sequences.
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What can the similarity of DNA sequences tell you about relatedness of species?
Similar anatomy found in different species may be homologous (shared due to ancestry) or analogous (shared due to similar selective pressures). Molecular similarities provide evidence for the shared ancestry of life. DNA sequence comparisons can show how different species are related.
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What can DNA sequences tell you about the relationships of organisms?
Scientists can estimate these relationships by studying the organisms’ DNA sequences. As the organisms evolve and diverge, their DNA sequences accumulate mutations. Scientists compare these mutations using sequence alignments to reconstruct evolutionary history.
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What does it mean to have similar DNA?
We say that two individuals share DNA when both individuals inherited the same DNA from the same ancestor. For example, you and your sister share DNA that you both inherited from the same parent. You and your first cousin share DNA inherited from your mutual grandparents.
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How does having similar DNA sequences show evolutionary relationships?
Because the DNA sequence determines a protein’s amino acid sequence, a gene shared by two closely related organisms should have similar, or even identical, amino acid sequences. That’s because closely related species most likely diverged from one another fairly recently in the evolutionary span.
