Cross-table 06:

Edged colour variety, inheritance recessive

mating hen 1
0-1 edged
(e)
hen 2
0-1 wildtype
( /e)
hen 3
0-1 wildtype
(-)
cock 1
1-0 edged
(e)
1-0 edged (e)
0-1edged (e)
1-0 edged (e)
1-0 wildtype ( /e)
0-1 edged (e)
0-1 wildtype ( /e)
1-0 wildtype ( /e)
0-1 wildtype ( /e)
cock 2
1-0 wildtype
( /e)
1-0 edged (e)
1-0 wildtype ( /e)
0-1 edged (e)
0-1 wildtype ( /e)
1-0 edged (e)
1-0 wildtype ( /e)
1-0 wildtype ( -)
0-1 edged (e)
0-1 wildtype ( /e)
0-1 wildtype (-)
1-0 wildtype ( /e)
1-0 wildtype (-)
0-1 wildtype ( /e)
0-1 wildtype (-)
cock 3
1-0 wildtype
( -)
1-0 wildtype ( /e)
0-1 wildtype ( /e)
1-0 wildtype ( /e)
1-0 wildtype (-)
0-1 wildtype ( /e)
0-1 wildtype (-)
1-0 wildtype (-)
0-1 wildtype (-)

Comments upon:
The edged colour variety inherits recessive. This means that hen and cock can be both split. The best combination: cock 1 x hen 1, both edged. The mating of a strong edged cock with a weak edged hen is obvious.
The next best combination is the combination cock 1 x hen 2 and cock 2 x hen 1. Here we find in the cross-table edged and splits.
Some remarks have to be made.
On the average more edged cocks then edged hens are born. This phenomenon is named: predominance. The ratio cocks: hens is about 4:1.
This counts especially for the strong edged Bourke’s.
According to the recessive inheritance, about 50% of the young of the combinations :cock 1 x hen 2 and cock 2 x hen 1 should be edged. But this percentage is much lower.
So the edged does not follow the rules. Maybe there are two recessive factors responsible for the edged colour variety . At this moment there is no better cross-table then presented here.
More information is presented in the case study for the early development of the edged.

Abbreviations:
(e) = edged
( /e) = split edged
(-) = no mutation factor
Colour:
dark yellow: best combination
bright yellow: nex best combination

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Copyright 2003 by Bob Fregeres

E-mail: fregeres@bourkes-parakeet.nl

1/2/04