270bp deletion removing most of the codons specifying Q or N from the 3' exon.

Fmr1^ΔQN partially rescues Fmr1³

Fmr1^ΔQN partially rescues the maternal effect embryonic lethality of Fmr1³.

Fmr1^ΔQN rescues the midline crossing phenotype of mushroom body β-lobe axons that is seen in Fmr1³ adults.

Fmr1^ΔQN does not rescue the increased number of boutons at the neuromuscular junction that is seen in homozygous Fmr1³ larvae.

Fmr1^ΔQN partially rescues the loss of rhythmic locomotion activity which is seen in Fmr1³ flies under constant darkness conditions.

Fmr1^ΔQN does not rescue the reduction in naive courtship activity seen in Fmr1³ males. The defects in immediate recall after training are partially rescued, while the short-term memory defects seen after training are not rescued; the rescued males show some reduction in courtship index at 0-2 minutes after training but no reduction in courtship index at 60 minutes after training when placed with a receptive female.