Answer:
To find out if the donated deer is a carrier of sickle cell anemia you would need to breed the donated deer with one of your other deer. If the deer is a carrier, 50% of the offspring will have the disease and 50% will not. If the deer is not a carrier, 100% of the offspring will not have the disease.
Punnet squares are in the file attached
Notes:
- Blue is one deer with sickle cell anemia, red is the donated deer