3. Blind fish are found in caves all over Northeastern Mexico. These fish are closely related to fish with normal vision that live in well-lit environments nearby. An evolutionary biologist is interested in the genetic basis of sight loss in the cave dwelling fish. After determining that blindness is a recessive trait in fish from two different caves, she crosses a blind fish from cave 1 to a blind fish from cave 2, and finds that 75% of the offspring are blind, and 25% are sighted. Which of the following interpretations fits this result best? Can two be possible? Fully explain your reasoning. A. Blindness in the fish from cave 1 vs. cave 2 is caused by fully penetrant mutations in the same gene. B. Blindness in the fishes from cave 1 vs. cave 2 are caused by mutations in the same gene that are not fully penetrant. C. Blindness in the fishes from cave 1 vs. cave 2 are caused by mutations in different genes. Wildtype or mutant aalleles of these genes may not be fully penetrant.
3. Blind fish are found in caves all over Northeastern Mexico. These fish are closely related to fish with normal vision that live in well-lit environments nearby. An evolutionary biologist is interested in the genetic basis of sight loss in the cave dwelling fish. After determining that blindness is a recessive trait in fish from two different caves, she crosses a blind fish from cave 1 to a blind fish from cave 2, and finds that 75% of the offspring are blind, and 25% are sighted. Which of the following interpretations fits this result best? Can two be possible? Fully explain your reasoning. A. Blindness in the fish from cave 1 vs. cave 2 is caused by fully penetrant mutations in the same gene. B. Blindness in the fishes from cave 1 vs. cave 2 are caused by mutations in the same gene that are not fully penetrant. C. Blindness in the fishes from cave 1 vs. cave 2 are caused by mutations in different genes. Wildtype or mutant aalleles of these genes may not be fully penetrant.
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:### Genetic Analysis of Blind Fish in Northeastern Mexico
**Question 3.**
Blind fish are found in caves all over Northeastern Mexico. These fish are closely related to fish with normal vision that live in well-lit environments nearby. An evolutionary biologist is interested in the genetic basis of sight loss in the cave-dwelling fish. After determining that blindness is a recessive trait in fish from two different caves, she crosses a blind fish from cave 1 with a blind fish from cave 2, and finds that **75% of the offspring are blind, and 25% are sighted**. Which of the following interpretations fits this result best? Can two be possible? Fully explain your reasoning.
**A.** Blindness in the fish from cave 1 vs. cave 2 is caused by fully penetrant mutations in the same gene.
**B.** Blindness in the fish from cave 1 vs. cave 2 are caused by mutations in the same gene that are not fully penetrant.
**C.** Blindness in the fish from cave 1 vs. cave 2 are caused by mutations in different genes. Wildtype or mutant alleles of these genes may not be fully penetrant.
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