In Drosophila, three autosomal genes have alleles as follows: Normal bristles (Sb) is dominant over stubble bristles (sb); straight wings (C) is dominant over curly wings (c); and red eye (Se) is dominant over sepia (se).Two test crosses were performed, with the results shown in the table. What linkage can you determine from these crosses?
A) Only Se and Sb are linked, with a distance of 32.2 units.
B) Only Sb and C are linked, with a distance of 48.7 units.
C) Only Se and C are linked, with a distance of 40.7 units.
D) None of the genes are linked.
E) All of the genes are on the same chromosome, Se and Sb are 32.2 units apart, and Sb and C are 48.7 units apart.

Question

In Drosophila, three autosomal genes have alleles as follows: Normal bristles (Sb) is dominant over stubble bristles (sb); straight wings (C) is dominant over curly wings (c); and red eye (Se) is dominant over sepia (se).Two test crosses were performed, with the results shown in the table.  What linkage can you determine from these crosses?
A) Only Se and Sb are linked, with a distance of 32.2 units. 
B) Only Sb and C are linked, with a distance of 48.7 units. 
C) Only Se and C are linked, with a distance of 40.7 units. 
D) None of the genes are linked. 
E) All of the genes are on the same chromosome, Se and Sb are 32.2 units apart, and Sb and C are 48.7 units apart.

Quizplus · Accepted Answer

The Answer of In Drosophila, three autosomal genes have alleles as follows: Normal bristles (Sb) is dominant over stubble bristles (sb); straight wings (C) is dominant over curly wings (c); and red eye (Se) is dominant over sepia (se).Two test crosses were performed, with the results shown in the table.  What linkage can you determine from these crosses?
A) Only Se and Sb are linked, with a distance of 32.2 units. 
B) Only Sb and C are linked, with a distance of 48.7 units. 
C) Only Se and C are linked, with a distance of 40.7 units. 
D) None of the genes are linked. 
E) All of the genes are on the same chromosome, Se and Sb are 32.2 units apart, and Sb and C are 48.7 units apart.

In Drosophila, Three Autosomal Genes Have Alleles as Follows: Normal