  In this paper, we ascertain the global $\lambda$-structure of the set of
positive and negative solutions bifurcating from $u=0$ for the semilinear
elliptic BVP \begin{equation*} \left\{\begin{array}{ll} -d\Delta u=
\lambda\langle \mathfrak{a},\nabla u\rangle+u+\lambda u^{2}-u^{q} & \text{ in }
\Omega, \\ u=0 & \text{ on } \partial\Omega, \end{array}\right. \end{equation*}
according to the values of $d>0$ and the integer number $q\geq 4$. Figures
1.1-1.3 summarize the main findings of this paper according to the values of
$d$ and $q$. Note that the role played by the parameter $\lambda$ in this model
is very special, because, besides measuring the strength of the convection, it
quantifies the amplitude of the nonlinear term $\lambda u^2$. We regard to this
problem as a mathematical toy to generate solution loops and isolas in Reaction
Diffusion equations.
