Change InnoDB to MYISAM after restore

[Beate Schlesiona]

I create bad situations and learn backup and recovery. There are MYISAM and InnoDB Tables in my Databases.
The databases where backuped with:
mysqldump --single-transaction --flush-logs --master-data=2 --all-databases > backup_saturday_1_PM.sql
After it, I droped the tablespace ibdata1 in the datadir.
I restore all databases with:
./bin/mysql -u root -p </backup/frank/backup_suturday_1_PM.sql
All databases are okay, but all tables are in MYISAM-format now.
Can somebody tell me the reason?