5. X^A X^a
6. AA
Explanation
It is in the nature of the animal to act as how their biological parents did. Genetically something in the brain keeps the "tradition" ongoing.
The lysosome is the mostly closely linked with the destruction of worn out cells.
This is referred to as: spontaneous recovery
Spontaneous recovery is a theory of learning and memory which involves unexpected and recurrence of a conditioned response after a period of reduced response or delay. Spontaneous recovery is associated with classical conditioning and operant conditioning. Extinction will happen quickly after a spontaneous recovery, if the conditioned and unconditioned stimulus is not connected.