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(a) Normal eye (b) Variegated eye FIGURE 19.3 A position effect that alters eye color in Drosophila. (a) A normal red eye. (b) An eye in which an eye color gene has been relocated to a heterochromatic chromosome. This can inactivate the gene in some cells and produces a variegated phenotype. Genes-Traits Variegated eye color occurs because the degree of heterochro- matin formation varies throughout different regions of the eye. In some cells, heterochromatin formation occurs and turns off the eye color gene, thereby leading to the white phenotype. In other cells, the region containing the eye color allele remains euchromatic, yielding a red phenotype. (a-b): © Dr. Jack R. Girton

(a) Normal eye (b) Variegated eye FIGURE 19.3 A position effect that alters eye color in Drosophila. (a) A normal red eye. (b) An eye in which an eye color gene has been relocated to a heterochromatic chromosome. This can inactivate the gene in some cells and produces a variegated phenotype. Genes-Traits Variegated eye color occurs because the degree of heterochro- matin formation varies throughout different regions of the eye. In some cells, heterochromatin formation occurs and turns off the eye color gene, thereby leading to the white phenotype. In other cells, the region containing the eye color allele remains euchromatic, yielding a red phenotype. (a-b): © Dr. Jack R. Girton

Human Anatomy & Physiology (11th Edition)
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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Has the DNA sequence of the eye color gene been changed in part (b) compared with part (a)? How do we explain the phenotypic difference?

(a) Normal eye (b) Variegated eye FIGURE 19.3 A position effect that alters eye color in Drosophila. (a) A normal red eye. (b) An eye in which an eye color gene has been relocated to a heterochromatic chromosome. This can inactivate the gene in some cells and produces a variegated phenotype. Genes-Traits Variegated eye color occurs because the degree of heterochro- matin formation varies throughout different regions of the eye. In some cells, heterochromatin formation occurs and turns off the eye color gene, thereby leading to the white phenotype. In other cells, the region containing the eye color allele remains euchromatic, yielding a red phenotype. (a-b): © Dr. Jack R. Girton
Transcribed Image Text:(a) Normal eye (b) Variegated eye FIGURE 19.3 A position effect that alters eye color in Drosophila. (a) A normal red eye. (b) An eye in which an eye color gene has been relocated to a heterochromatic chromosome. This can inactivate the gene in some cells and produces a variegated phenotype. Genes-Traits Variegated eye color occurs because the degree of heterochro- matin formation varies throughout different regions of the eye. In some cells, heterochromatin formation occurs and turns off the eye color gene, thereby leading to the white phenotype. In other cells, the region containing the eye color allele remains euchromatic, yielding a red phenotype. (a-b): © Dr. Jack R. Girton
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