The brown-nosed tweety bird can be found in both urban and wild environments. Researchers collected 100 birds from a forest, and divided them into two groups of 50 birds, each with 25 males and 25 females. One group was released into the forest and the other into a nearby city. After 1 year, a group of hardworking students collected all 100 birds and measured stress indices associated with signalling by their "stress glucocorticoid hormone", corticosterone (a steroid). They find that compared to the forest birds, the urban birds have greater levels of a stressed phenotype. Which of the following observations is MOST LIKELY to be part of the explanation for this observation? The urban birds have similar levels of corticosterone, but higher levels of the membrane receptor for this glucocorticoid The urban birds have genetic differences in their glucocorticoid receptor to give it higher affinity, making them more sensitive to corticosterone. The urban birds have lower expression of genes that possess glucocorticoid- response elements in their promoter. The urban birds have higher levels of corticosterone, but similar levels of the corticosterone receptor.
The brown-nosed tweety bird can be found in both urban and wild environments. Researchers collected 100 birds from a forest, and divided them into two groups of 50 birds, each with 25 males and 25 females. One group was released into the forest and the other into a nearby city. After 1 year, a group of hardworking students collected all 100 birds and measured stress indices associated with signalling by their "stress glucocorticoid hormone", corticosterone (a steroid). They find that compared to the forest birds, the urban birds have greater levels of a stressed phenotype. Which of the following observations is MOST LIKELY to be part of the explanation for this observation? The urban birds have similar levels of corticosterone, but higher levels of the membrane receptor for this glucocorticoid The urban birds have genetic differences in their glucocorticoid receptor to give it higher affinity, making them more sensitive to corticosterone. The urban birds have lower expression of genes that possess glucocorticoid- response elements in their promoter. The urban birds have higher levels of corticosterone, but similar levels of the corticosterone receptor.
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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Transcribed Image Text:The brown-nosed tweety bird can be found in both urban and wild environments.
Researchers collected 100 birds from a forest, and divided them into two groups of
50 birds, each with 25 males and 25 females. One group was released into the forest
and the other into a nearby city. After 1 year, a group of hardworking students
collected all 100 birds and measured stress indices associated with signalling by their
"stress glucocorticoid hormone", corticosterone (a steroid). They find that compared
to the forest birds, the urban birds have greater levels of a stressed phenotype.
Which of the following observations is MOST LIKELY to be part of the explanation
for this observation?
The urban birds have similar levels of corticosterone, but higher levels of the
membrane receptor for this glucocorticoid
The urban birds have genetic differences in their glucocorticoid receptor to give
it higher affinity, making them more sensitive to corticosterone.
The urban birds have lower expression of genes that possess glucocorticoid-
response elements in their promoter.
The urban birds have higher levels of corticosterone, but similar levels of the
corticosterone receptor.
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