DNA Fingerprinting worksheet featuring questions and a gel electrophoresis image for educational use.

It looks like you've uploaded a DNA Fingerprinting Worksheet with several questions related to interpreting DNA gel electrophoresis results (commonly known as DNA fingerprinting). Since I can't view images directly, I'll help you solve the problems based on typical formats and content of such worksheets. Please provide the text or description of the questions and diagrams, or describe what’s in the image.

However, I can guide you through how to interpret DNA fingerprinting gels and answer common types of questions found on such worksheets.

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🔬 Understanding DNA Fingerprinting:

- DNA fingerprinting uses restriction enzymes to cut DNA into fragments.
- These fragments are separated by gel electrophoresis — smaller fragments move faster and travel farther than larger ones.
- The resulting pattern of bands is unique to an individual (except identical twins).
- Each band represents a fragment of DNA of a specific size.

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Let me now go through the likely questions on your worksheet and explain how to solve them:

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Question 1:

> "The DNA fingerprints were made from blood samples taken from a puppy and four possible parents. According to the information, which dog was probably the father of this puppy?"

#### ✔ How to Solve:
- Look at the bands in the puppy’s DNA profile.
- Compare each band in the puppy to those in the potential fathers.
- A child inherits half its DNA from each parent — so the puppy's bands should match half from mother and half from father.
- Find the male dog whose band pattern shares the most bands with the puppy that are not shared with the mother.

👉 Answer: Circle the dog that shows shared bands with the puppy not present in the mother.

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Question 2:

> "The picture shows a segment of DNA from a man. Which of these is most likely the father of this child?"

#### ✔ How to Solve:
- Again, compare the child’s bands to both parents.
- The child must inherit one copy of each allele from the mother and one from the father.
- If the mother’s DNA has certain bands, any band in the child not in the mother must come from the father.
- So, look for the male whose DNA includes all the bands in the child that aren’t in the mother.

👉 Answer: Choose the male who has all the missing bands (from the mother) present in the child.

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Question 3:

> "Mrs. Smith has a baby named Tyra. She believes one of two men can be the father of her child. A paternity test is done using DNA analysis. Which of the 2 men could be baby Tyra’s father?"

#### ✔ How to Solve:
- Compare Tyra’s DNA to Mrs. Smith’s DNA.
- Any band in Tyra that is not in the mother must come from the father.
- Check if either man has all those extra bands.
- If a man lacks any of the bands that the child has but the mother doesn’t, he cannot be the father.

👉 Answer: Only the man who has all the necessary paternal bands (i.e., matches the non-maternal bands in the child) could be the father.

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Question 4:

> "A crime investigation is underway. The victim was murdered. Two suspects were tested. Some of the DNA evidence was found under the victim’s fingernails. Which suspect is the murderer?"

#### ✔ How to Solve:
- Compare the DNA from the evidence (under fingernails) to the DNA of the two suspects.
- If the band pattern of the evidence matches one suspect exactly, that person is likely the attacker.
- If it doesn’t match either, then neither may be guilty — but usually one will match.

👉 Answer: Circle the suspect whose DNA profile matches the evidence sample.

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🧠 General Tips:

- Band matching: Bands must align vertically in the same position.
- No extra bands: A child cannot have a band that neither parent has.
- Presence/absence matters: If a band appears in the child but not in either parent → impossible (unless mutation, rare).
- Shared bands: Look for overlap between individuals.

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If you can describe the diagrams (like how many lanes, where the bands are, labels), I can give you the exact answers.

For example:
> "Lane 1: Mother, Lane 2: Suspect A, Lane 3: Suspect B, Lane 4: Child. The child has bands at positions 5, 8, 10. Mother has 5 and 8. Suspect A has 10 and 12. Suspect B has 10 and 9."

Then I can say:
➡️ Child has band at 10, not in mother → must come from father.
➡️ Only Suspect A has band at 10 → Suspect A is the father.

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Please reply with details about the images or text, and I’ll give you exact answers with explanations!