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1. In Drosophila, the genes for body color (B = black, b = brown), wing size (S = short, s = long) and eye shape (E = oval, e = round) are on different chromosomes. A fly that is heterozygous for all three traits is crossed with a fly that is homozygous recessive for all three traits. Use a branch diagram to answer the following question set. 1a. Determine the gametes produced by each parent. 1b. Perform a trihybrid testcross between the two flies. 1c. What is the phenotypic ratio of the offspring.

1. In Drosophila, the genes for body color (B = black, b = brown), wing size (S = short, s = long) and eye shape (E = oval, e = round) are on different chromosomes. A fly that is heterozygous for all three traits is crossed with a fly that is homozygous recessive for all three traits. Use a branch diagram to answer the following question set. 1a. Determine the gametes produced by each parent. 1b. Perform a trihybrid testcross between the two flies. 1c. What is the phenotypic ratio of the offspring.

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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1. In Drosophila, the genes for body color (B = black, b = brown), wing size (S = short, s = long) and eye shape (E = oval, e = round) are on different chromosomes. A fly that is heterozygous for all three traits is crossed with a fly that is homozygous recessive for all three traits. Use a branch diagram to answer the following question set. 1a. Determine the gametes produced by each parent. 1b. Perform a trihybrid testcross between the two flies. 1c. What is the phenotypic ratio of the offspring.
Transcribed Image Text:1. In Drosophila, the genes for body color (B = black, b = brown), wing size (S = short, s = long) and eye shape (E = oval, e = round) are on different chromosomes. A fly that is heterozygous for all three traits is crossed with a fly that is homozygous recessive for all three traits. Use a branch diagram to answer the following question set. 1a. Determine the gametes produced by each parent. 1b. Perform a trihybrid testcross between the two flies. 1c. What is the phenotypic ratio of the offspring.
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