When the peroxidase system is blocked or when it is hereditarily absent from the cells, the rate of formation of thyroid hormones falls to zero

TLS Online TPP Program

#Id: 7417

#Unit 5. Developmental Biology

Antennapedia complex, contains the homeotic genes: Labial (lab)

Antennapedia (Antp)

Sex combs reduced (scr), Deformed (dfd) 

Proboscipedia (pb)

TLS Online TPP Program

#Id: 7418

#Unit 5. Developmental Biology

Three protein-coding genes are found in bithorax complex: 

Ultrabithorax (Ubx)

Abdominal A (abdA) 

Abdominal B (AbdB) 

TLS Online TPP Program

#Id: 7419

#Unit 5. Developmental Biology

Ultrabithorax (Ubx), is required for the identity of the third thoracic segment.

TLS Online TPP Program

#Id: 7420

#Unit 5. Developmental Biology

one of Antennapedia’s functions is to repress the genes that would trigger antenna and eye development.

TLS Online TPP Program

#Id: 7421

#Unit 5. Developmental Biology

when flies have a mutation wherein the Antennapedia gene is expressed in the head (as well as in the thorax), legs rather than antennae grow out of the head sockets

TLS Online TPP Program

#Id: 7422

#Unit 5. Developmental Biology

In the recessive mutant of Antennapedia, the gene fails to be expressed in the second thoracic segment, and antennae sprout in the leg positions