Stripe 2 would become fainter in flies that lack the gene that encodes Bicoid. Thus the correct answer is option (B).
The homeotic protein known as Bicoid is encoded by the Bicoid maternal effect gene in Drosophila. The anterior-posterior (A-P) axis is shaped during Drosophila development by a gradient in the concentration of the homeotic protein known as Bicoid. Bicoid was the first protein that was demonstrated to have morphogen-like properties. Although Bicoid is essential for Drosophila and other higher dipterans to thrive, it is absent in most other insects, where alternative genes take their place. The bicoid gene plays a crucial role in the early embryo's establishment of the head-to-tail axis. Without a bicoid, the embryo cannot form a head or a tail; instead, its body parts develop in an arbitrary order. This is due to the bicoid's role in patterning the embryo's anterior-posterior axis. To put it another way, it aids in figuring out which end of the embryo will develop into the head and which end will develop into the tail.
The complete question is:
Study the section of the chapter addressing with Figure. What would you expect to see in flies that lack the gene that encodes Bicoid? (Assume that Bicoid does not influence the expression of the others)
a. Stripe 2 would expand toward the tail of the embryo.
b. Stripe 2 would become fainter.
c. Stripe 2 would expand toward the head of the embryo.
d. Stripe 2 would become narrower.
e. All 7 stripes would disappear.
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