What is the observed phenotype when the ultrabithorax gene is deleted in Drosophila?
1
The third thoracic segment is transformed into another second thoracic segment resulting in a fly with four wings.
2
Since it specifies the second thoracic segment, instead of antenna leg grows out of the head socket.
3
Since it specifies the third thoracic segment, a fly with two pairs of halters develop.
4
Since this gene fails to be expressed in the second thoracic segment, the antennae sprout in the leg position.