1. What is Dog Coat Color Genetics?

Dog coat color is determined by genetic inheritance. This calculator focuses on the B locus which controls black vs. brown pigment. The dominant B allele produces black pigment, while the recessive b allele produces brown.

2. How Does the Calculator Work?

The calculator uses basic Mendelian genetics principles:

Where:

• B — Dominant allele for black color
• b — Recessive allele for brown color
• BB — Homozygous black
• Bb — Heterozygous black (carries brown)
• bb — Homozygous brown

Explanation: Each parent contributes one allele to their offspring, resulting in possible combinations shown in the Punnett square.

3. Understanding Genotypes and Phenotypes

Details: The genotype is the genetic makeup (BB, Bb, bb), while the phenotype is the physical appearance (black or brown coat).

4. Using the Calculator

Tips: Select the known or suspected genotype for each parent. If unsure, choose the phenotype you observe (BB for black, Bb for black carrying brown, or bb for brown).

5. Frequently Asked Questions (FAQ)

Q1: What if I don't know the parent's exact genotype?
A: If a black dog has produced brown offspring, it must be Bb. Otherwise, you can't be certain without genetic testing.

Q2: Are there other genes that affect dog coat color?
A: Yes, many other genes (E locus, A locus, etc.) interact with the B locus to produce the full range of dog coat colors.

Q3: Can two black dogs have brown puppies?
A: Yes, if both parents are Bb carriers, they have a 25% chance of producing bb (brown) puppies.

Q4: How accurate is this calculator?
A: It accurately predicts B locus inheritance, but actual coat color may be affected by other genetic factors.

Q5: What's the difference between genotype and phenotype?
A: Genotype is the genetic code, phenotype is the physical expression. Two dogs with Bb genotype will both be black (phenotype) but carry the brown allele.