Simple Explanation of Genetics
Many people seem have trouble understanding the basic principle of genetic inheritance because it is usually expressed in a complicated way. I shall try and explain it in a simple way
If you mate a green budgie to a blue budgie you will get a green bird that is split to blue because green is dominant. This bird is described as green/blue (the slash “/” means split The part before the slash is the visible part, after the slash are the hidden genes)
If you mate two green/blue birds together you will get greens that are not split, greens that are split and blues.
It works like this:
The chicks take half from each parent
So the 1st chick takes the green from the male and the green from the female, it is a green that is not split. (Green/Green)
The 2nd chick takes the green from the male and the blue from the female, it is a green bird that is split to blue (Green/Blue)
The 3rd chick takes the blue from the male and the green from the female, so it is also a green bird split to blue (Green/Blue) (green being dominant)
The 4th chick takes the blue from the male and the blue from the female, so it is a blue bird. (Blue/Blue)
Each of these 4 chicks represents 25% of the clutch so we can expect 25% green, 50% Green/blue & 25% blue (Note: They will come in random order and you may get several of 1 type before you get any of another)
The green birds that are split will look exactly the same as the green birds that are not split but when you breed them you will get a different result
This pattern works exactly the same with any dominant mutation paired with a recessive mutation
Example: with Spangles which are dominant to normal (you wouldn’t usually refer to them as split but remember that they got 1 part from each parent)
1st chick – Spangle/Normal
2nd chick – Spangle/Normal
3rd chick – Normal/Normal
4th chick – Normal/Normal
%50% Spangle, 50% Normal
example: Greywing which are recessive to Normals
1st chick – Normal/Greywing (Normal being dominant)
2nd chick - Normal/Greywing
3rd chick - Normal/Greywing
4th chick - Normal/Greywing
100% Normal/Greywing. These birds all look normal but because they are split to greywing if they are mated to another bird that has greywing genes they will produce greywings
The sex linked mutations work a bit differently.
If this is any help to anyone then I’ll try and explain the sex linked mutations, the dark factor, combined mutations and double factors some other time
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