This diagram illustrates regulation of the Pitx-1 gene, which is expressed in various cell types • during certain stages of animal embryonic development. Answer the questions that follow: Promoter Coding Region I Pelvis Offactory Jaw Regulatory Segments ("Switches") a. Which portion of this sequence gets transcribed and translated into a protein? b. Which portion of this sequence underwent a deletion mutation in certain species of freshwater stickleback fish? Did that mutation have an impact on the amino acid sequence of the protein, when it was expressed? С.

Human Anatomy & Physiology (11th Edition)
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Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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5.
This diagram illustrates regulation of the Pitx-1 gene, which is expressed in various cell types
• during certain stages of animal embryonic development. Answer the questions that follow:
Promoter
Coding Region
Pelvis
Olfactory
Jaw
Regulatory Segments
("Switches")
a. Which portion of this sequence gets transcribed and translated into a protein?
b. Which portion of this sequence underwent a deletion mutation in certain species of
freshwater stickleback fish?
Did that mutation have an impact on the amino acid sequence of the protein, when it was
expressed?
С.
d. If this switch underwent the same mutation in a turtle embryo, how would the turtle's
phenotype be impacted?
е.
Would this phenotypic change in the turtle likely be adaptive? Briefly explain.
Transcribed Image Text:5. This diagram illustrates regulation of the Pitx-1 gene, which is expressed in various cell types • during certain stages of animal embryonic development. Answer the questions that follow: Promoter Coding Region Pelvis Olfactory Jaw Regulatory Segments ("Switches") a. Which portion of this sequence gets transcribed and translated into a protein? b. Which portion of this sequence underwent a deletion mutation in certain species of freshwater stickleback fish? Did that mutation have an impact on the amino acid sequence of the protein, when it was expressed? С. d. If this switch underwent the same mutation in a turtle embryo, how would the turtle's phenotype be impacted? е. Would this phenotypic change in the turtle likely be adaptive? Briefly explain.
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