Double tail genetics

Genetic inheritance of double tail

The double tail trait is a simple recessive trait.

I will show four different cross possibilities.

double tail = "dt"

normal state (single) = "+"

double tail (dtdt) x single tail cross (++)
X	+	+
dt	dt+	dt+
dt	dt+	dt+
All fish will be single tail carrying the dt gene "dt geno" This can result in increased dorsal ray count providing a fuller appearance

double tail (dtdt) x double tail geno (dt+)
X	dt	+
dt	dtdt	dt+
dt	dtdt	dt+
50% double tail 50% single tail with "dt geno"

double tail geno (dt+) x double tail geno (dt+)
X	dt	+
dt	dtdt	dt+
+	+dt	++
25% double tails 25% single tail 50% single tail with "dt geno"

double tail (dtdt) x double tail cross (dtdt)
X	dt	dt
dt	dtdt	dtdt
dt	dtdt	dtdt
All fish will be double tail - Not generally recommended for successive generations This can result in decreased body length and increased body thickness.

Beautiful double tail red
Fish and Photo by Leng Lim