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
Chapter14: Human Inheritance
Section: Chapter Questions
Problem 2GP: Human females have two X chromosomes XX; males have one X and one Y chromosome XY. a. With respect...
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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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