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Background to Problems 1 and 2. When a fly (Drosophila) strain with round, brown eyes was crossed to a different strain with kidney-shaped, red eyes, all F1 flies had eyes that were round and red. When these F1 flies were test crossed (i.e., mated to a suitable test strain), there were four distinct eye phenotypes observed in the F2, all at approximately the same frequency (i.e., ~ 25% each), namely: 1) round & red; 2) round & brown; 3) kidney-shaped & red; and 4) kidney-shaped & brown. 1) How many different genes (each with two alleles) control the eye phenotype in this example? 2) What was the phenotype of the test strain flies?

Background to Problems 1 and 2. When a fly (Drosophila) strain with round, brown eyes was crossed to a different strain with kidney-shaped, red eyes, all F1 flies had eyes that were round and red. When these F1 flies were test crossed (i.e., mated to a suitable test strain), there were four distinct eye phenotypes observed in the F2, all at approximately the same frequency (i.e., ~ 25% each), namely: 1) round & red; 2) round & brown; 3) kidney-shaped & red; and 4) kidney-shaped & brown. 1) How many different genes (each with two alleles) control the eye phenotype in this example? 2) What was the phenotype of the test strain flies?

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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be holding online office hours Tuesday morning. Background to Problems 1 and 2. When a fly (Drosophila) strain with round, brown eyes was crossed to a different strain with kidney-shaped, red eyes, all F1 flies had eyes that were round and red. When these Fi flies were test crossed (i.e., mated to a suitable test strain), there were four distinct eye phenotypes observed in the F2, all at approximately the same frequency (i.e., ~ 25% each), namely: 1) round & red; 2) round & brown; 3) kidney-shaped & red; and 4) kidney-shaped & brown. 1) How many different genes (each with two alleles) control the eye phenotype in this example? 2) What was the phenotype of the test strain flies?
Transcribed Image Text:be holding online office hours Tuesday morning. Background to Problems 1 and 2. When a fly (Drosophila) strain with round, brown eyes was crossed to a different strain with kidney-shaped, red eyes, all F1 flies had eyes that were round and red. When these Fi flies were test crossed (i.e., mated to a suitable test strain), there were four distinct eye phenotypes observed in the F2, all at approximately the same frequency (i.e., ~ 25% each), namely: 1) round & red; 2) round & brown; 3) kidney-shaped & red; and 4) kidney-shaped & brown. 1) How many different genes (each with two alleles) control the eye phenotype in this example? 2) What was the phenotype of the test strain flies?
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