Fix gene activation logic.

code/game/dna/genes/gene.dm

@@ -104,11 +104,10 @@
 	var/list/deactivation_messages=list()
 
 /datum/dna/gene/basic/can_activate(var/mob/M,var/flags)
-	// Probability check
-	if(flags & MUTCHK_FORCED || probinj(activation_prob,(flags&MUTCHK_FORCED)))
+	if(flags & MUTCHK_FORCED)
 		return 1
-
-	return 0
+	// Probability check
+	return probinj(activation_prob,(flags&MUTCHK_FORCED))
 
 /datum/dna/gene/basic/activate(var/mob/M)
 	M.mutations.Add(mutation)

code/game/dna/genes/goon_powers.dm

@@ -54,7 +54,7 @@
 		if(!istype(T))
 			return
 		if(T.lighting_lumcount <= 2)
-			M.alpha = round(255 * 0.05)
+			M.alpha = 0
 		else
 			M.alpha = round(255 * 0.80)
 

code/game/dna/genes/powers.dm

@@ -71,6 +71,8 @@
 		block=COLDBLOCK
 
 	can_activate(var/mob/M,var/flags)
+		if(flags & MUTCHK_FORCED)
+			return !(/datum/dna/gene/basic/cold_resist in M.active_genes)
 		// Probability check
 		var/_prob = 15
 		if(M_RESIST_COLD in M.mutations)
@@ -90,6 +92,8 @@
 		block=FIREBLOCK
 
 	can_activate(var/mob/M,var/flags)
+		if(flags & MUTCHK_FORCED)
+			return !(/datum/dna/gene/basic/heat_resist in M.active_genes)
 		// Probability check
 		var/_prob=30
 		if(M_RESIST_HEAT in M.mutations)