From the given DNA fingerprint result, identify who is the father ... - Free Printable

The image you've uploaded appears to be a DNA fingerprinting (or DNA profiling) gel electrophoresis result, commonly used in paternity testing or forensic analysis. The bands represent different DNA fragments that have been separated by size.

Let’s analyze the data:

Labels:

- BABY: The child whose parentage is being determined.
- Mother: The known mother of the baby.
- PERSON 1: A potential father.
- PERSON 2: Another potential father.

Each vertical lane shows the DNA profile for one individual. The horizontal black bars represent DNA fragments (alleles) at specific genetic loci (labeled 1 through 11).

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Goal:

Determine which person (Person 1 or Person 2) is the biological father of the baby.

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Principle of DNA Inheritance:

- A child inherits one allele from each parent at each locus.
- Therefore, each band in the baby's profile must match either the mother or the father.
- If a band in the baby does not match the mother, it must come from the father.

We’ll compare the baby’s bands with the mother’s and see which person (Person 1 or 2) can account for the remaining bands.

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Step-by-step Comparison:

Let’s go locus by locus (1 to 11):

| Locus | Baby | Mother | Person 1 | Person 2 | Match? |
|-------|------|--------|----------|----------|--------|
| 1 | ✔ | ✔ | ✘ | ✔ | Person 2 |
| 2 | ✔ | ✔ | ✘ | ✔ | Person 2 |
| 3 | ✔ | ✔ | ✔ | ✘ | Person 1 |
| 4 | ✔ | ✘ | ✔ | ✘ | Person 1 |
| 5 | ✔ | ✔ | ✘ | ✔ | Person 2 |
| 6 | ✔ | ✔ | ✔ | ✘ | Person 1 |
| 7 | ✔ | ✘ | ✔ | ✘ | Person 1 |
| 8 | ✔ | ✘ | ✔ | ✘ | Person 1 |
| 9 | ✔ | ✘ | ✔ | ✘ | Person 1 |
| 10 | ✔ | ✔ | ✔ | ✘ | Person 1 |
| 11 | ✔ | ✔ | ✔ | ✘ | Person 1 |

Now, let’s interpret:

- For loci where the baby has a band not present in the mother, it must come from the father.
- So we look at loci where baby has a band but mother doesn’t:
- Locus 4: Baby has band, mother doesn’t → must come from father → Person 1 has it, Person 2 doesn’t → so Person 1 is possible
- Locus 7: Baby has band, mother doesn’t → Person 1 has it, Person 2 doesn’t → Person 1
- Locus 8: Same → Person 1
- Locus 9: Same → Person 1

So far, all these non-maternal bands are only present in Person 1, not in Person 2.

Now check if Person 1 can account for all baby’s bands:
- At every locus, either:
- Baby matches mother → good
- Baby matches Person 1 → good
- Baby does not match Person 2 when mother doesn't → so Person 2 cannot be father

For example:
- Locus 4: Mother has no band, baby has it → must come from father → only Person 1 has it → Person 2 cannot be father
- Similarly, loci 7, 8, 9: same logic

Now check if there are any inconsistencies with Person 1:
- All baby’s bands are either in mother or in Person 1.
- No band in baby is missing from both mother and Person 1.

Also, Person 1 has bands that the baby has, and Person 2 lacks those.

But wait — let’s double-check locus 3:
- Baby has band → mother has it → so this could be maternal
- Person 1 also has it → okay
- Person 2 does not → but since mother has it, that’s fine

Similarly, locus 10: Baby has band, mother has it, Person 1 has it, Person 2 does not → okay

Now, any locus where baby has a band not in mother and not in Person 1? → No.

But Person 2 has bands at loci where the baby does not (e.g., locus 3, 4, 7, etc.) — but that’s okay; they just don’t contribute.

The key is: all non-maternal bands in the baby must be in the father.

Let’s list non-maternal bands in baby:

- Locus 4: baby has it, mother doesn’t → must come from father → Person 1 has it, Person 2 doesn’t → only Person 1 can be father
- Locus 7: same → Person 1 only
- Locus 8: same → Person 1 only
- Locus 9: same → Person 1 only

So Person 2 cannot be the father because he doesn’t have the necessary alleles.

Therefore, Person 1 is the biological father.

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Final Answer:

✔ Person 1 is the biological father of the baby.

Explanation:

- The baby inherits one allele from each parent at each locus.
- The mother contributes half of the baby’s DNA.
- The remaining alleles must come from the father.
- At several loci (4, 7, 8, 9), the baby has bands that the mother does not have, so they must come from the father.
- Only Person 1 has those bands.
- Person 2 lacks these bands and thus cannot be the father.

This is consistent with Mendelian inheritance and standard DNA paternity testing.

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✔ Conclusion: PERSON 1 is the father.