Question

Scientists use PCR to check three calves born to the same cow for a gene sequence from hemoglobin. The sequence is unique to one of the three bulls (bull A, as opposed to bulls B and C) with which the cow has run during mating season.
Connect the calves with their fathers as much as possible.

Calf Has sequence?

1. No

2. No

3. Yes

Answer 1

Father Bull A is likely the father of Calf 3, as it has the unique gene sequence from hemoglobin that is specific to Bull A. Bulls B and C are likely not the fathers of any of the calves since neither calf 1 nor calf 2 have the unique gene sequence.