In an online Flylab, F1 females are mated to vestigial-winged (VG), star-eyed (S

Question

In an online Flylab, F1 females are mated to vestigial-winged (VG), star-eyed (ST), shaven-bristled (SV) males, with the following results (ignoring sex) Offspring Number Proportion Ratio 0.4724 0.0004 0.0032 0.0275 0.0272 0.0028 0.0002 0.4663 Phenotype 2383.500 2.000 Sv VG ST VG:SV ST SV ST:VG 4139 39 544 249 219 573 25 16.000 139.000 137.500 14.000 ST VG:SV 4192 2353.000 Total 9980 All three genes segregate as an autosomal recessive mutant phenotype. 16) Which gene is in the middle of this linkage group? 17) Give the map of the genes above, including gene order and map distance. 18) What is the Coefficient of Coincidence for this linkage group?

Explanation / Answer

Ans 16:

From the data we can observe that:

SV,ST genes together are present in maximum cases, followed by SV,VG.

However, VG,ST are present in minimum number of individuals. This means that VG and ST genes are farther apart from each other than they are to the SV gene.

Hence, SV gene is in the middle.

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