Which of the following results support the conclusion that Homeobox genes act combinatorially to specify segmental identity? Check all that apply.
Question 2 options:
Ubx, AbdA and AbdB triple mutants display a reiteration of the second thoracic segment (T2) in place of the abdominal segments, whereas the T3 and A1 segments are replaced by a reiteration of T2 in Ubx single mutants.
The thoracic segments T1, T2, T3 and abdominal segments A1, A2, A3 and A4 are specified correctly in AbdB mutants, whereas only T1, T2, T3, and A1 segments are specified correctly in AbdA and AbdB double mutants.
Posteriorly expressed homeotic genes repress more anteriorly expressed homeotic genes.
Legs grow out of the head in Antp mutants.