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Basic color genetics | common color crosses

Iridescent Colors
Steel Blue => blbl Royal Blue => Blbl or blBl Green => BlBl

 

 

    
Steel Blue X Steel Blue Steel Blue X Royal Blue Steel Blue X Green
X bl bl
bl blbl blbl
bl blbl blbl

100% Steel
X Bl

bl
bl blBl blbl
bl blBl blbl

50% Steel - 50% Royal
X Bl Bl
bl blBl blBl
bl blBl blBl

100% Royal
Royal Blue X Royal Blue Royal Blue X Green Green X Green
X Bl bl
Bl BlBl Blbl
bl blBl blbl

50% Royal 25% Steel 25% Green
X Bl Bl
Bl BlBl BlBl
bl blBl blBl

50% Royal - 50% Green
X Bl Bl
Bl BlBl BlBl
Bl BlBl BlBl

100% Green

 

Lets now look at a little more involved cross... we cross two fish that are royal blue / geno melano (m)

Royal geno melano (Blblm+) x Royal geno melano (Blblm+)
X Bl m Bl + bl m bl +
Bl m BlBlmm BlBlm+ Blblmm Blblm+
Bl + BlBl+m BlBl++ Blbl+m Blbl++
bl m blBlmm blBlm+ blblmm blblm+
bl + blBl+m blBl++ blbl+m blbl++

37.5% Royal with 50% geno melano
18.75% Green with 50% geno melano
18.75% Steel with 50% geno melano
25% Melanos with 50% of them having Royal iridocyte, 25% Green and 25% Steel

The "+" sign is used to designate the normal state ie: no melano

The small "m" is used to show that melano (m) is recessive to the normal wild state (+).

Anything with two "m"'s should be a black with the corresponding iridocyte color

 

Now we add the double "dt" geno to it

Royal geno melano/dt (Blbl+m+dt) x Royal geno melano/dt (Blbl+m+dt)
X Bl + + Bl m + Bl + dt Bl m dt bl + + bl m + bl + dt bl m dt
Bl + + BlBl++++ BlBl+m++ BlBl+++dt BlBl+m+dt Blbl++++ Blblmm Blbl+++dt Blbl+m+dt
Bl m + BlBlm+++ BlBlmm++ BlBlm++dt BlBlmm+dt Blblm+++ Blbl+m Blblm++dt Blblmm+dt
Bl + dt BLBl++dt+ BlBl+mdt+ BlBl++dtdt BlBl+mdtdt BlBl++dt+ Blbl+mdt+ Blbl++dtdt Blbl+mdtdt
Bl m dt BlBlm+dt+ BlBlmmdt+ BlBlm+dtdt BlBlmmdtdt Blblm+dt+ Blblmmdt+ Blblm+dtdt Blblmmdtdt
bl + + blBl++++ blBl+m++ blBL+++dt blBl+m+dt blbl++++ blbl+m++ blbl+++dt blbl+m+dt
bl m + blBlm+++ blBlmm++ blBlm++dt blBlmm+dt blblm+++ blblmm++ blblm++dt blblmm+dt
bl + dt blBl++dt+ blBL+mdt+ blBl++dtdt blBl+mdtdt blbl++dt+ blbl+mdt+ blbl++dtdt blbl+mdtdt
bl m dt blBLm+dt+ blBLmmdt+ blBlm+dtdt blBlmmdtdt blblm+dt+ blblmmdt+ blblm+dtdt blblmmdtdt

Anything with two "m's" should be a black with the corresponding iridocyte color

Anything with two "dt's" will show a double tail

As you can see... it is pretty easy to figure out the basic genetic outcome if you have an idea about the parents gentic makeup

Next I'll add in the a fish with geno cambodian "+c"

For a look at this cross with geno cambodian (c) added click here...it gets big!

 

Non-Iridescent Colors
Yellow => RR / cc / nrnr
Red => RR / ++ / ++

RR =extended red, cc = Cambodia, nr = non-red
++ = normal(wild) state

Yellow X Yellow (f1...) Yellow X Red (f1) Red X Red (f1...)
X R c nr
R c nr

RR/cc/nrnr

100% Yellow

X R + +
R c nr

RR/c+/nr+

100% Red with
Yellow & Cambodian Genotype

X R + +
R + +

RR/++/++

100% Red
Yellow X Red (f2 crosses) RR/c+/nr+

 

X R + + R + nr R c + R c nr
R + + RR/++/++ RR/++/+nr RR/+c/++ RR/+c/+nr
R + nr RR/++/nr+ RR/++/nrnr RR/+c/nr+ RR/+c/nrnr
R c + RR/c+/++ RR/c+/+nr RR/cc/++ RR/cc/+nr
R c nr RR/c+/nr+ RR/c+/nrnr RR/cc/nr+ RR/cc/nrnr


Results would be dispersed in the following ratios...

Red (9) Chocolate (3) Red Cambodian (3) Yellow (1)

 
Yellow parent RR/cc/nrnr to Yellow X Red young (PF1 crosses) RR/c+/nr+
X R + + R + nr R c + R c nr
R c nr RR/c+/nr+ RR/c+/nrnr RR/cc/nr+ RR/cc/nrnr

Results would be dispersed in the following ratios...

Red (1) Chocolate (1) Red Cambodian (1) Yellow (1)
Red parent RR/++/++ to Yellow X Red young (PF1 crosses) RR/c+/nr+


X R + + R + nr R c + R c nr
R + + RR/++/++ RR/++/+nr RR/+c/++ RR/+c/+nr

Results would be all reds...

.
Red parent RR/++/++ to Red Cambodian young (PF2 crosses) RR/cc/++

 

X R c +
R + + RR+c++

Results would be all reds...

 
Red parent RR/++/++ to Chocolate young (PF2 crosses) RR/++/nrnr

 

X R + nr
R + + RR+++nr

Results would be all reds...

 
Yellow RR/cc/nrnr to Chocolate young (PF2 crosses) RR/++/nrnr

 

X R + nr
R c nr RRc+nrnr

Results would be all chocolates...
assuming the chocolate did not posess a single "c" gene.

 
Yellow RR/cc/nrnr to Red Cambodian young (PF2 crosses) RR/cc/++

 

X R c +
R c nr RRccnr+

Results would be all Red Cambodians...
assuming the Red Cambodian did not posess a single "nr" gene.

 

 

All photographs within are taken by me of my fish except where noted.
All photographs © Kevin Pelletier '98,'99,00' and reproducible only with my permission.
This page created and maintained by me