What is the correct order of expression of the genes listed below in the determination of segmentation in Drosophila?
(1) Segment polarity genes
(2) Hox genes
(3) Gap genes
(4) Pair rule genes
A) 4, 3, 1, 2
B) 3, 4, 1, 2
C) 1, 2, 3, 4
D) 2, 3, 1, 4
E) 3, 1, 4, 2

Question

What is the correct order of expression of the genes listed below in the determination of segmentation in Drosophila?
 (1) Segment polarity genes
(2) Hox genes
(3) Gap genes
(4) Pair rule genes
A) 4, 3, 1, 2
B) 3, 4, 1, 2
C) 1, 2, 3, 4
D) 2, 3, 1, 4
E) 3, 1, 4, 2

Quizplus · Accepted Answer

The correct order of gene expression during the determination of segmentation in Drosophila is gap genes, pair rule genes, segment polarity genes, and finally Hox genes. Gap genes establish the basic body plan by determining the boundaries of broad regions along the anterior-posterior axis. Pair rule genes refine the pattern by dividing the broad regions into smaller segments. Segment polarity genes establish the anterior-posterior polarity within each segment. Finally, Hox genes determine the identity of each segment. Therefore, option B correctly reflects the correct order of gene expression during the segmentation process in Drosophila.

What Is the Correct Order of Expression of the Genes