In Drosophila, three autosomal genes have alleles as follows: Straight bristles (Hk) is dominant over hooked bristles (hk); straight wings (A) is dominant over arc wings (a); and red eye (Bw) is dominant over brown eye (bw).Two test crosses were performed, with the results shown in the table. What linkage can you determine from these crosses?
A) Only Hk and A are linked, with a distance of 45.3 units.
B) Only A and Bw are linked, with a distance of 5.3 units.
C) Only Hk and Bw are linked, with a distance of 40.0 units.
D) None of the genes are linked.
E) All of the genes are on the same chromosome; Hk and A are 45.3 units apart, and A and Bw are 5.3 units apart.

Question

In Drosophila, three autosomal genes have alleles as follows: Straight bristles (Hk) is dominant over hooked bristles (hk); straight wings (A) is dominant over arc wings (a); and red eye (Bw) is dominant over brown eye (bw).Two test crosses were performed, with the results shown in the table.  What linkage can you determine from these crosses?
A) Only Hk and A are linked, with a distance of 45.3 units. 
B) Only A and Bw are linked, with a distance of 5.3 units. 
C) Only Hk and Bw are linked, with a distance of 40.0 units. 
D) None of the genes are linked. 
E) All of the genes are on the same chromosome; Hk and A are 45.3 units apart, and A and Bw are 5.3 units apart.

Quizplus · Accepted Answer

The Answer of In Drosophila, three autosomal genes have alleles as follows: Straight bristles (Hk) is dominant over hooked bristles (hk); straight wings (A) is dominant over arc wings (a); and red eye (Bw) is dominant over brown eye (bw).Two test crosses were performed, with the results shown in the table.  What linkage can you determine from these crosses?
A) Only Hk and A are linked, with a distance of 45.3 units. 
B) Only A and Bw are linked, with a distance of 5.3 units. 
C) Only Hk and Bw are linked, with a distance of 40.0 units. 
D) None of the genes are linked. 
E) All of the genes are on the same chromosome; Hk and A are 45.3 units apart, and A and Bw are 5.3 units apart.

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