Let me carefully analyze the problem and the DNA gel images.
First, I need to understand what's being asked:
1. Mr. Big died, leaving a wife, daughter, and inheritance
2. Two men claim to be the long-lost son of Mr. & Mrs. Big
3. Before marriage, Mr. & Mrs. Big had an illegitimate child they placed for adoption
4. They tried to find him after becoming wealthy but failed
5. DNA samples were taken from: Mrs. Big, the daughter, son 1, son 2 (the two claimants)
6. We need to determine which man(s) are telling the truth (i.e., which one(s) are biologically related to Mr. & Mrs. Big)
Looking at the DNA gel on the left:
- Labeled: mom, daughter, son 1, son 2
- Each has bands representing DNA fragments
- In DNA paternity/maternity testing, a child inherits half their DNA from each parent
- So a child's DNA bands should be a combination of bands from both parents
For the left gel (Mrs. Big, daughter, son 1, son 2):
- The daughter should share some bands with mom (maternal) and some with dad (Mr. Big, who isn't tested here)
- Son 1 and son 2 should each share half their bands with mom and half with Mr. Big
But we don't have Mr. Big's DNA, so we need to infer based on which son's DNA pattern is consistent with being the biological child of Mrs. Big and some father (Mr. Big), while also considering that the daughter is the known biological child.
Let me examine the band patterns more closely by zooming in on the left gel.
Parent Tip: Review the logic above to help your child master the concept of dna fingerprint worksheet.
