An Experiment Was Done to Determine the Linkage Relationship of Three

An experiment was done to determine the linkage relationship of three genes (a,b,and c)in Drosophila melanogaster.Homozygous females phenotypically a,c were crossed with homozygous males phenotypically b.The F₁ females were all wild type in appearance,and the F₁ males were all a,c.The F₁ females and males were crossed to give the following F₂ phenotypes and numbers.
$\quad$ $\quad$ $\quad$ $\quad$ $\quad$$\text { Number of }$
$\begin{array}{|c|c|c|}\hline &\text { Males } & \text { Females }\\\hline a+c & 242 & 310 \\\hline+b+ & 238 & 0 \\\hline a b+ & 157 & 0 \\\hline++c & 163 & 190 \\\hline a b c & 59 & 0 \\\hline+++ & 61 & 295 \\\hline a++ & 38 & 205 \\\hline+b c & 42 & 0 \\\hline \text { Total } & 1,000 & 1,000 \\\hline\end{array}$
a)Give the genotypes of the parents.
b)Give the genotypes of the F₁ flies,and show the genotypic arrangement in the female F₁.
c)Draw a genetic map showing the order of the genes and the distances between them.
d)Calculate the interference (only if necessary;if not,say "I = 0").