diff --git a/rust-pvz-genetics/src/genetics/gene.rs b/rust-pvz-genetics/src/genetics/gene.rs
index 11b73fb..02eff57 100644
--- a/rust-pvz-genetics/src/genetics/gene.rs
+++ b/rust-pvz-genetics/src/genetics/gene.rs
@@ -11,3 +11,12 @@ pub enum GeneType {
     Consumer,
     Modifier,
 }
+
+impl Gene {
+    pub fn new(place_str: impl Into<String>, kind: GeneType) -> Self {
+        Self {
+            place: place_str.into(),
+            kind,
+        }
+    }
+}
diff --git a/rust-pvz-genetics/src/genetics/genome.rs b/rust-pvz-genetics/src/genetics/genome.rs
index f95bf40..3264911 100644
--- a/rust-pvz-genetics/src/genetics/genome.rs
+++ b/rust-pvz-genetics/src/genetics/genome.rs
@@ -1,8 +1,8 @@
 use crate::genetics::{gene::Gene, edge::Edge};
 
 pub struct PlantGenome {
-    genes: Vec<Gene>,
-    edges: Vec<Edge>
+    pub(crate) genes: Vec<Gene>,
+    pub(crate) edges: Vec<Edge>
 }
 
 impl PlantGenome {
@@ -16,13 +16,13 @@ impl PlantGenome {
         if let None = parent && self.genes.len() > 0 {
             return Some(PlantGenomeInsertError::RootExists);
         }
-        if let Some(_) = self.genes.iter().find(|g| **g == gene){
+        if self.genes.contains(&gene){
             return Some(PlantGenomeInsertError::GeneExists);
         }
 
         if let Some(parent_gene) = parent {
             let edge = Edge::new(parent_gene,gene.clone());
-            if let Some(_) = self.edges.iter().find(|e| **e == edge) {
+            if self.edges.contains(&edge) {
                 return Some(PlantGenomeInsertError::EdgeExists);
             }
             self.edges.push(edge);
@@ -32,7 +32,7 @@ impl PlantGenome {
         self.update_graph();
         return None;
     }
-    fn update_graph(&mut self) {
+    pub(crate) fn update_graph(&mut self) {
         // Sort by parent to guarantee root at [0]
         self.edges.sort();
     }
@@ -46,6 +46,7 @@ impl PlantGenome {
     }
 }
 
+#[derive(Debug)]
 pub enum PlantGenomeInsertError {
     GeneExists,
     EdgeExists,
diff --git a/rust-pvz-genetics/src/genetics/genome_builder.rs b/rust-pvz-genetics/src/genetics/genome_builder.rs
new file mode 100644
index 0000000..d7dbe31
--- /dev/null
+++ b/rust-pvz-genetics/src/genetics/genome_builder.rs
@@ -0,0 +1,63 @@
+use crate::genetics::prelude::*;
+
+pub struct GenomeBuilder {
+    genome: PlantGenome,
+    current_gene: usize,
+}
+
+impl GenomeBuilder {
+
+    pub fn new() -> Self {
+        Self {
+            genome: PlantGenome::new(),
+            current_gene: 0
+        }
+    }
+
+    pub fn finish(mut self) -> PlantGenome {
+        self.genome.update_graph();
+        return self.genome;
+    }
+
+    pub fn create_root(mut self, root: Gene) -> Result<Self,GenomeBuilderError> {
+        if self.genome.genes.len() > 0 {
+            return Err(GenomeBuilderError::RootExists);
+        }
+        self.genome.genes.push(root);
+
+        return Ok(self);
+    }
+
+    pub fn insert_gene(mut self, gene: Gene, parent: Gene) -> Result<Self,GenomeBuilderError> {
+        if self.genome.genes.contains(&gene){
+            return Err(GenomeBuilderError::GeneExists);
+        }
+
+        let edge = Edge::new(parent,gene.clone());
+        if self.genome.edges.contains(&edge) {
+            return Err(GenomeBuilderError::EdgeExists);
+        }
+
+        self.genome.edges.push(edge);
+
+        self.current_gene = self.genome.genes.len();
+        self.genome.genes.push(gene);
+
+        Ok(self)
+    }
+    pub fn add_gene(mut self, gene: Gene) -> Result<Self,GenomeBuilderError> {
+       if self.genome.genes.len() == 0 {
+           return Err(GenomeBuilderError::RootDoesntExist);
+       }
+       todo!();
+    }
+    
+}
+
+#[derive(Debug)]
+pub enum GenomeBuilderError {
+    RootExists,
+    RootDoesntExist,
+    GeneExists,
+    EdgeExists,
+}
diff --git a/rust-pvz-genetics/src/genetics/mod.rs b/rust-pvz-genetics/src/genetics/mod.rs
index 62cc2bf..91e1dc0 100644
--- a/rust-pvz-genetics/src/genetics/mod.rs
+++ b/rust-pvz-genetics/src/genetics/mod.rs
@@ -4,6 +4,7 @@ pub mod plant_templates;
 pub mod edge;
 pub mod gene;
 pub mod genome;
+pub mod genome_builder;
 
 pub mod prelude {
     pub use crate::genetics::edge::*;
diff --git a/rust-pvz-genetics/src/genetics/plant_templates.rs b/rust-pvz-genetics/src/genetics/plant_templates.rs
new file mode 100644
index 0000000..6abc0a8
--- /dev/null
+++ b/rust-pvz-genetics/src/genetics/plant_templates.rs
@@ -0,0 +1,7 @@
+use crate::genetics::{genome_builder::GenomeBuilder, prelude::*};
+
+pub fn peashooter_template() -> PlantGenome {
+    GenomeBuilder::new()
+        .create_root(Gene::new("base", GeneType::Producer)).unwrap()
+        .finish()
+}