iii) A cross is made between homozygous wild- type female Drosophila (a* a* b*b* c*c*) and triple mutant male (aa bb cc) (the order here is arbitrary). The F_{1} (ata b*b c*c) females are test crossed back to the triplet mutant males and the F₂ phenotypic ratios are as follows:
a+bc
18
ab+c
112
abc
308
a^{+}b^{+}c
66
abc+
59
a^{+}b^{+}c^{+}
321
a^{+}bc^{+}
102
ab^{+}c^{+}
15
1000
From the above data draw a map segment showing order and distance among loci.
