Phylogenetic Distance Calculator
Calculate genetic distance between DNA sequences using p-distance and Jukes-Cantor models.
Input Parameters
Enter DNA sequences and select calculation method.
Understanding Phylogenetic Distance
Phylogenetic distance measures the evolutionary divergence between two species or sequences. It quantifies how much genetic change has occurred since their last common ancestor.
p-Distance
The simplest measure of genetic distance is the p-distance, which is the proportion of nucleotide sites at which two sequences differ.
p = (number of differences) / (total sites compared)Jukes-Cantor Model
The Jukes-Cantor model corrects for multiple substitutions at the same site, providing a better estimate of evolutionary distance for closely related sequences.
d = -0.75 × ln(1 - (4/3) × p)Where d is the corrected distance and p is the observed p-distance.
Applications
- Constructing phylogenetic trees
- Estimating evolutionary relationships
- Studying genetic variation within populations
- Comparative genomics and molecular evolution
Limitations
These models assume equal mutation rates and no selection. For more complex analyses, consider using specialized phylogenetic software like MEGA, PAUP*, or BEAST.
Distance Interpretation
p < 0.01
Highly similar sequences, recent common ancestor.
0.01 ≤ p < 0.05
Closely related, shared ancestry within species or close genera.
0.05 ≤ p < 0.1
Moderately divergent, different species or genera.
p ≥ 0.1
Highly divergent, ancient common ancestor or different families.
Phylogenetic Distance Formula
p-Distance = (Number of Differences) / (Total Sites Compared)
Jukes-Cantor Distance = -0.75 × ln(1 - (4/3) × p)
p-Distance
Simple proportion of differing sites, uncorrected for multiple mutations.
Jukes-Cantor Model
Corrects for saturation, assumes equal mutation rates for all nucleotides.
Step-by-Step Calculation
- Enter two DNA sequences in the input fields.
- Select the distance model (p-Distance or Jukes-Cantor).
- Click "Calculate Distance" to compute the genetic distance.
- Review the results, including differences, total sites, and distance values.
- Interpret the distance based on the provided guidelines.
Features
- Supports p-Distance and Jukes-Cantor distance calculations
- Handles DNA sequences up to 10,000 nucleotides
- Automatic sequence cleaning and validation
- Real-time interpretation of distance values
- Free and easy-to-use online tool
Applications
- Phylogenetic tree construction
- Evolutionary relationship estimation
- Population genetics studies
- Molecular evolution research
- Comparative genomics
Related Keywords
Academic & Scientific References
For further understanding and validation of the formulas used above, we recommend exploring these authoritative resources: