A diploid plant is a trihybrid for flower color (gene "F"),leaf size (gene "L")and seed weight (gene "S");its phenotype includes red flowers,large leaves,and heavy seeds.This plant is crossed to a tester plant (which has white flowers,small leaves,and light seeds).The progeny is as follows:

$\begin{array}{|l|l|}\hline23 \text { Red, heavy, large } & 232 \text { White, heavy, large } \\\hline 25 \mathrm{Red}, \text { heavy, small } & 228 \text { White, heavy, small } \\\hline 230 \mathrm{Red} \text {, light, large } & 25 \text { White, light, large } \\\hline 235 \mathrm{Red} \text {, light, small } & 26 \text { White, light, small }\\\hline\end{array}$
What can be concluded about the linkage relationships of the three genes in question?

In a diploid invertebrate,genes D and E are closely linked.Single crossovers between these two genes occurs only in 1 out of 40 meioses,and multiple crossovers are never observed.If an individual has the genotype D e/d E,what percentage of its gametes are expected to be recombinant (either DE or de)?

Out of 800 progeny of a three-point testcross,there were 16 double crossover recombinants,whereas 80 had been expected on the basis of no interference.The interference is: