Question

In Drosophila, a set of homeotic genes which control body plan at the time of organ differentiation is known as
A. TATA box
B. Homeobox
C. Pribnow box
D. All of the above

Answer 1

Hint: Transcription unit is the segment of DNA that takes part in transcription. It has three components a) a promoter, b) the structural gene and c) a terminator. TATA box is an AT rich region which is present in a promoter in many cases. It is present in eukaryotes. The bacterial homolog of the TATA box is the Pribnow box (TATAAT).

Complete answer:
The homeotic genes play a vital role during embryonic development in Drosophila.
They play an important role in the specification of the individual identity of each segment of the insect’s body.
The proteins coded by the homeotic genes show a 60 amino acid motif, the homeo box.
The helix turn helix structure of the motif enables them to bind as transcription factors to specific DNA sequences.
The first homeobox genes were identified in Drosophila.
The Antennapedia complex (ANT-C) and the Bithorax complex (BX-C) are the two gene clusters where most homeotic genes of Drosophila are located.
Five genes in ANT-C play a major role in the specification of the identity of some segments of the head and that of the first and second thoracic segment.
The identities of the posterior compartment of the second and the third thoracic segments and of the eight abdominal segments is determined by the three genes present on BX-C.

In Drosophila, a set of homeotic genes which control body plan at the time of organ differentiation is known as B) Homeobox.

Additional information: -
The study of fundamentals genetics as well as the study of the development of tissue and organs is often carried out with the help of Drosophila melanogaster as a model organism.
The Drosophila genome is homologous to that of the human genome by 60%.

Note: Homeobox genes are found in animals, fungi, and plants and more recently have been found in many single-celled eukaryotes.
Drosophila melanogaster is a species of fly. The species is also known as a common fruit fly or vinegar fly.
It belongs to the family of Drosophilidae.