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Headcolor

Black head

Zwartkop

Black head is a sex-linked recessive trait.
When the male has on one of the two chromosomes a blackhead factor is head color is not black but he is a carrier (split). When he has the blackhead factor on both chromosomes, he will have a black head. The female will have a black head when she has one black headed factor on a chromosome. The female can never be split for black head.
Several body colors affect the head color. The yellow-gene suppresses the black color. When the body color is yellow, the black head color will be ash-gray to white.

The formulas for black head used in this calculator are:
- Black head male (red beak): Zr/Zr y+/y+
- Black head female (red beak): Zr/W y+/y+
- Black head genetically yellow head male (yellow beak): Zr/Zr y/y
- Black head genetically yellow head female (yellow beak): Zr/W y/y
- Black head split yellow head male (yellow beak): Zr/Zr y+/y
- Black head split yellow head female (yellow beak): Zr/W y+/y

More information about the sex-linked trait can be found under the menu item Sex-linked.

Read head

Roodkop

Red head is a sex-linked dominant trait.
When the man has on both chromosomes has a redhead factor, the head color will be red. He also has a red head when the redhad factor in one of the two chromosomes. The femle will have a red head when she has a redhead factor on one chromosome. Male or female can never be split for red head.
Several body colors affect the head color where the blue gene suppresses the red and yellow color. When the body color is blue then the red head color is salmon pink to beige.

The formulas for red head used in this calculator are:
- Red head male: ZR/ZR y+/y+
- Red head female: ZR/W y+/y+
- Red head split black head male: ZR/Zr y+/y+
- Red head split yellow head male: ZR/ZR y+/y
- Red head split black head split yellow head male: ZR/Zr y+/y
- Red head split yellow head female: ZR/W y+/y

More information about the sex-linked trait can be found under the menu item Sex-linked.

Yellow head

Oranjekop

Yellow head is an autosomal recessive trait.
There should also be a red head gene present in order to be visible. When two yellow head genes are present and no red headed genes (just blackhead genes) the gouldian finch will have a black head with an orange beak point. Male and female both can be split for yellow head.
Several body colors affect the head color where the blue gene suppresses the red and yellow color. When the body color is blue then the orange head color is salmon pink to beige.

The formulas for yellow head used in this calculator are:
- Yellow head male: ZR/ZR y/y
- Yellow head female: ZR/W y/y