Question

Mutation of homeotic cluster genes often results in which of the followings defects in Drosophila?

• A. absence of a group of contiguous segments
• B. transformation of one segment into another
• C. polority defects in every segment along the anterior posterior axis
• D. tumor formation in imaginery disc
• E. absense of every other segments along the anterior posterior axis

Answer 1

Answer: (A)

absence of a group of contiguous segments

Homeotic genes are genes which regulate the development of anatomical structures in various organisms. Homeotic genes are expressed late in fly development and control segment determination. Mutation in these genes results in absence of a group of segments.

So, the correct option is 'absence of a group of contiguous segments'.