Molecular Evidence for Evolution_Unsolved PaperSECTION NAME
Chapter: Heredity and Evolution | Topic: Molecular Evidence for Evolution
MOLECULAR EVIDENCE FOR EVOLUTION_UNSOLVED PAPERSECTION NAME
Topic: Molecular Evidence for Evolution
Q1.Which molecule carries hereditary information and can provide evidence about evolutionary relationships?
- DNA
- Water
- Glucose
- Starch
Q2. If two organisms have very similar DNA sequences for a particular gene, this may suggest that they:
- Have no biological relationship
- May share a common ancestor
- Must belong to exactly the same species
- Cannot show any variation
Q3. Molecular evidence for evolution can be obtained by comparing:
- DNA and protein sequences
- Body temperature only
- Amount of water in organisms
- Size of habitats only
Q4. Which observation would generally provide stronger evidence of a close evolutionary relationship?
- Very similar DNA sequences
- Similar habitat colour
- Similar body size only
- Living in the same geographical area
Q5. A greater number of differences in corresponding DNA sequences between two organisms may indicate:
- A possible greater evolutionary distance
- That neither organism has DNA
- That evolution has not occurred
- That the organisms are always identical
Q6. Why can molecular comparisons be useful in studying evolution?
- Molecules contain inherited information that can be compared among organisms
- Molecules are never affected by inheritance
- All organisms have exactly the same DNA sequence
- Molecular information cannot change over generations
Short questions
Q1. What is meant by molecular evidence for evolution?
Q2. How can similarities in DNA sequences provide evidence for common ancestry?
Q3. Why can scientists compare proteins as well as DNA when studying evolutionary relationships?
Q4. What does it suggest if two organisms have many similarities in their DNA sequences?
Q5. Suppose students compare a short DNA sequence from two organisms during a biology activity and find that most of the sequence is similar.
What could this similarity suggest about their evolutionary relationship?Suppose students compare a short DNA sequence from two organisms during a biology activity and find that most of the sequence is similar.
What could this similarity suggest about their evolutionary relationship?
Q6. A computer program can compare DNA sequences from different organisms and identify matching sections.
Why might such comparisons be useful to evolutionary scientists?
Q1. Explain how DNA similarities and differences can be used as evidence for evolutionary relationships between organisms.
Q2. Describe how molecular evidence can support the idea that different organisms may have evolved from common ancestors. Include the importance of comparing inherited molecular sequences.
Q3. Scientists compare a particular protein in three organisms and find that Organism A and Organism B have very similar protein sequences, while Organism C has many more differences.
Explain what scientists could investigate from this observation when studying evolutionary relationships.
Q1. Scientists compare a DNA segment containing 100 bases in two organisms. They find that 8 bases are different.
a) What percentage of the bases are different?
b) What percentage of the bases are similar?
Q2.Three organisms have the following numbers of differences in a particular DNA sequence of 200 bases:
a) Calculate the percentage difference for each comparison.
b) Which pair has the smallest percentage difference?
Q3. A researcher compares a protein containing 150 amino acids in two organisms. The comparison shows 15 amino acid differences.