Under what conditions does one expect a $1$:$1$:$1$:$1$ ratio? A$)$ AABB$$aabb B$)$ AaBb$$AaBb C$)$ AaBb$$aabb D$)$ AAbb$$aaBB E$)$ Aabb$$AABB a$)A.$ b$)B.$ c$)C.$ d$)D.$ e$)E.$ Under what conditions does one expect a $1$:$1$:$1$:$1$ ratio? A$)$ AABB$$aabb B$)$ AaBb$$AaBb C$)$ AaBb$$aabb D$)$ AAbb$$aaBB E$)$