A D. melanogaster male is homozygous for a translocation between chromosomes 2 and 3. This fly is otherwise wild-type. This male is crossed to a female fly that is homozygous for normal chromosome order and is homozygous for dumpy wings (dy), a recessive on chromosome 2 and sepia eyes (se), a recessive on chromosome 3. A male progeny from the above cross is test-crossed to a female fly that is homozygous for dy and se. What progeny phenotypes and frequencies are expected from this second cross? Answer choices 1/2 wild-type and 1/2 dumpy and sepia 1/4 wild-type, 1/4 dumpy, 1/4 sepia, 1/4 dumpy and sepia All dumpy and sepia 2/3 wild-type, 1/3 dumpy and sepia 9/16 wild-type, 3/16 dumpy, 3/16 sepia, 1/16 dumpy and sepia
A D. melanogaster male is homozygous for a translocation between chromosomes 2 and 3. This fly is otherwise wild-type. This male is crossed to a female fly that is homozygous for normal chromosome order and is homozygous for dumpy wings (dy), a recessive on chromosome 2 and sepia eyes (se), a recessive on chromosome 3. A male progeny from the above cross is test-crossed to a female fly that is homozygous for dy and se. What progeny phenotypes and frequencies are expected from this second cross? Answer choices 1/2 wild-type and 1/2 dumpy and sepia 1/4 wild-type, 1/4 dumpy, 1/4 sepia, 1/4 dumpy and sepia All dumpy and sepia 2/3 wild-type, 1/3 dumpy and sepia 9/16 wild-type, 3/16 dumpy, 3/16 sepia, 1/16 dumpy and sepia
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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A D. melanogaster male is homozygous for a translocation between chromosomes 2 and 3. This fly is otherwise wild-type. This male is crossed to a female fly that is homozygous for normal chromosome order and is homozygous for dumpy wings (dy), a recessive on chromosome 2 and sepia eyes (se), a recessive on chromosome 3. A male progeny from the above cross is test-crossed to a female fly that is homozygous for dy and se. What progeny phenotypes and frequencies are expected from this second cross?
Answer choices
1/2 wild-type and 1/2 dumpy and sepia
1/4 wild-type, 1/4 dumpy, 1/4 sepia, 1/4 dumpy and sepia
All dumpy and sepia
2/3 wild-type, 1/3 dumpy and sepia
9/16 wild-type, 3/16 dumpy, 3/16 sepia, 1/16 dumpy and sepia
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