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In Drosophila,the Genes Y,f,and V Are All X-Linked Determine the Linkage Arrangement of These Three Genes and Calculate

question 58

Essay

In Drosophila,the genes y,f,and v are all X-linked.y f v females are crossed to wild-type males and the F1 females are test-crossed.The F2 are distributed as follows.
yfv3210yf+72y+v1024y++678+fv690+f+1044++v60+++322210,000\begin{array} { | l | r | } \hline y f v & 3210 \\\hline y f + & 72 \\\hline y + v & 1024 \\\hline y + + & 678 \\\hline + f v & 690 \\\hline + f + & 1044 \\\hline + + v & 60 \\\hline + + + & \underline { 3222 } \\\hline & 10,000 \\\hline\end{array}
Determine the linkage arrangement of these three genes and calculate the map distances.


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