diff --git a/rust-pvz-genetics/Cargo.lock b/rust-pvz-genetics/Cargo.lock
index 0e71028..d8f2725 100644
--- a/rust-pvz-genetics/Cargo.lock
+++ b/rust-pvz-genetics/Cargo.lock
@@ -55,6 +55,12 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "fixedbitset"
+version = "0.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d674e81391d1e1ab681a28d99df07927c6d4aa5b027d7da16ba32d1d21ecd99"
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
@@ -247,6 +253,18 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a846cbc04412cf509efcd8f3694b114fc700a035fb5a37f21517f9fb019f1ebc"
 
+[[package]]
+name = "petgraph"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8701b58ea97060d5e5b155d383a69952a60943f0e6dfe30b04c287beb0b27455"
+dependencies = [
+ "fixedbitset",
+ "hashbrown 0.15.5",
+ "indexmap",
+ "serde",
+]
+
 [[package]]
 name = "prettyplease"
 version = "0.2.37"
@@ -332,6 +350,7 @@ name = "rust-pvz-genetics"
 version = "0.1.0"
 dependencies = [
  "godot",
+ "petgraph",
  "rand",
  "serde",
 ]
diff --git a/rust-pvz-genetics/Cargo.toml b/rust-pvz-genetics/Cargo.toml
index 86b8d32..e1ba692 100644
--- a/rust-pvz-genetics/Cargo.toml
+++ b/rust-pvz-genetics/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2024"
 
 [dependencies]
 godot = "0.4.5"
+petgraph = "0.8.3"
 rand = "0.10.0"
 serde = { version = "1.0.228", features = ["derive"] }
 
diff --git a/rust-pvz-genetics/src/genetics/manipulations.rs b/rust-pvz-genetics/src/genetics/manipulations.rs
index bfb7a95..9a844aa 100644
--- a/rust-pvz-genetics/src/genetics/manipulations.rs
+++ b/rust-pvz-genetics/src/genetics/manipulations.rs
@@ -79,6 +79,13 @@ impl PairGenomeModificator {
         (self.genome_a.clone(),self.genome_b.clone())
     }
     pub fn combine(&mut self) -> (Genome,Genome){
+        let donor_gene: usize = self.generator.random_range(0..self.genome_a.graph.len());
+        let mut extracted = vec![self.genome_a.graph.remove(donor_gene)];
+        let mut idx = 0;
+        while idx < extracted.len() {
+            for child_idx
+            idx += 1;
+        }
         (self.genome_a.clone(),self.genome_b.clone())
     }
     pub fn cancel(&self) -> (Genome,Genome) {
diff --git a/rust-pvz-genetics/src/godot_wrapper/reference_modifiers.rs b/rust-pvz-genetics/src/godot_wrapper/reference_modifiers.rs
index 232f53c..f2e2e1f 100644
--- a/rust-pvz-genetics/src/godot_wrapper/reference_modifiers.rs
+++ b/rust-pvz-genetics/src/godot_wrapper/reference_modifiers.rs
@@ -12,6 +12,15 @@ pub struct ReferencePairModifier {
     base: Base<Node>,
 }
 
+#[derive(GodotClass)]
+#[class(base=Node)]
+pub struct ReferenceSingleModifier {
+    #[export]
+    godot_genome: Option<Gd<GodotGenome>>,
+    modifier: Option<SingleGenomeModificator>,
+    base: Base<Node>
+}
+
 #[godot_api]
 impl INode for ReferencePairModifier{
     fn init(base: Base<Node>) -> Self {
@@ -39,6 +48,30 @@ impl INode for ReferencePairModifier{
 
 }
 
+#[godot_api]
+impl INode for ReferenceSingleModifier {
+    fn init(base: Base<Node>) -> Self {
+        Self {
+            godot_genome: None,
+            modifier: None,
+            base
+        }
+    }
+    fn ready(&mut self) {
+        let Some(genome) = self.godot_genome.as_ref() else {
+            godot_warn!("The genome is not specified!");
+            return;
+        };
+
+        let Some(genome) = genome.bind().get_genome() else {
+            godot_warn!("Genome does not contain a genome!");
+            return;
+        };
+
+        self.modifier = Some(SingleGenomeModificator::new(genome));
+    }
+}
+
 #[godot_api]
 impl ReferencePairModifier {
     #[func]
@@ -63,5 +96,15 @@ impl ReferencePairModifier {
             godot_error!("Modifier is not initialized!");
         }
     }
+    #[func]
+    fn combine(&mut self) {
+        if let Some(pair) = self.modifier.as_mut() {
+            let (genome_a,genome_b) = pair.combine();
+            self.godot_genome_a.as_mut().unwrap().bind_mut().set_genome(genome_a);
+            self.godot_genome_b.as_mut().unwrap().bind_mut().set_genome(genome_b);
+        }
+        else {
+            godot_error!("Modifier is not initialized!");
+        }
+    }
 }
-