Answered: Barrier insulators stop the spread of…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

Using the experimental system shown in Figure 12-26, a
geneticist is able to insert a barrier insulator between the
white gene and the heterochromatin. The eye phenotype of the transgenic Drosophila would most likely be
a. all white because the barrier element will prevent
the spread of heterochromatin.
b. all red because the barrier element will prevent the
spread of heterochromatin.
c. still variegated because barrier elements don’t stop
the spread of heterochromatin.
d. still variegated because barrier elements don’t work
in Drosophila.

Barrier insulators stop the spread of heterochromatin
HР-1
HMȚase
HAT
FIGURE 12-26 In this model, barier
insulators recruit enzymatic activities such
as histone acetyltransferase (HAT) that
promote euchromatin formation. The letter
"M" stands for methylation, and the letter
"A" for acetylation.
Heterochromatin
Euchromatin
Barrier
insulator

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