Female Tsetse flies heterozygous for 3 recessivemutations, t (tiny body), sq (squint eyes) and sb (soft bristles)were testcrossed to homozygous t, sq, sb/ t, sq, sb individuals andthe following progeny were obtained:
Wild-type                              201                         Tiny,squint, soft bristles234       Â
Softbristles                         162                          Tiny,squint                                        204
Tiny 24                          Tiny,softbristles                              1041
Squint1104                       Squint, softbristles        30
A)
If the 3 genes are on the same chromosome, determine the mapdistance separating the 2 genes t and sb?
a) 1.4 centiMorgans.
b) 1.63 centiMorgans.
c) 14 centiMorgans.
d) 16.3 centiMorgans.
e) 30.3 centiMorgans.
B)
the 3 genes are on the same chromosome, determine the mapdistance between the 2 genes t and sq?
a) 1.4 centiMorgans.
b) 1.63 centiMorgans.
c) 14 centiMorgans.
d) 16.3 centiMorgans.
e) 30.3 centiMorgans.
C)
If the 3 genes are on the same chromosome, determine theorder of the 3 genes using the data provided?
(Hint: Remember, it is not possible to ascertain which gene comesfirst or last on the chromosome using ONLY the data above. Hence,there may be more than one potentially correct answer below. Ifso, choose EACH possible correct answer.)
a) sb, sq, t.
b) sb, t, sq.
c) t, sq, sb.
d) sq, t, sb.
e) t, sb, sq
D)
What was the genotype of the two chromosomes containing the 3 genesin the female parents?
a) t, sb, sq+/t+, sb+, sq.
b) t, sb, sq/ t+, sb+, sq+.
c) t+, sb, sq/ t, sb+, sq+.
d) t+, sq+, sb/ t, sq+, sb+.
e) You cannot tell from the data provided.
