Question

e once again, two men were involved in a paternity suit brought by a woman against her estranged husband. the woman was seeking child support for her infant from her husband, but the husband accused the womans lover of being the biological father. unfortunately, blood typing was inconclusive: both men had the same blood type. so the judge ordered dna analysis. a sample of blood was taken from the mother, the baby, and both men. the results are shown below.

	baby	mom	lover	husband
2		===
3	----		---	---
4	----		---
5	----	---		---
6	----	---		---
7				---
8	----		---
9			---	---
10	----	---		---
11	----	---		---

which of the men are most likely the father?

Explanation:

Step1: Match baby's DNA to parents

A child inherits one allele from each parent, so every DNA band in the baby must come from either the mother or the biological father.

Step2: Compare baby to lover

Check each band of the baby:

• Band1: Baby has it, mom has it → from mom
• Band3: Baby has it, mom has it → from mom
• Band4: Baby has it, mom does not; lover has it → matches
• Band5: Baby has it, mom has it → from mom
• Band6: Baby has it, mom has it → from mom
• Band8: Baby has it, mom does not; lover has it → matches
• Band10: Baby has it, mom has it → from mom
• Band11: Baby has it, mom has it → from mom

All baby bands are covered by mom + lover.

Step3: Compare baby to husband

Check band4: Baby has it, mom does not; husband does not have it → cannot be from husband.
Band8: Baby has it, mom does not; husband does not have it → cannot be from husband.
These bands break the inheritance rule for the husband.

Answer:

The woman's lover is most likely the biological father.