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.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter16: Gene Expression

Section: Chapter Questions

Problem 28CTQ: A scientific study demonstrated that rat mothering behavior impacts the stress response in their...

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