Crossing strawberry varieties with red and white berries resulted in hybrids with pink berries, and in the second

Crossing strawberry varieties with red and white berries resulted in hybrids with pink berries, and in the second generation (F2) there were about 1000 plants with white berries, 2000 with pink berries and 1000 with red ones. 1) How many types of gametes does the F1 hybrid form? 2) How many different genotypes are there among F2 hybrids with pink berries? 3) How many different phenotypes will result from backcrossing an F1 hybrid with a white-fruited variety? 4) How many different genotypes will result from crossing an F1 hybrid with a white-fruited variety? 5) How many different phenotypes will result from crossing an F1 hybrid with a red-fruited variety?

Solution.
Genotypes:
AA – red berries
Aa – pink berries
Aa – white berries.

Answer:
12
2) 1
3) 2
4) 2
5) 2.