>>6977337Alright, genetics lesson:
Imagine that the possibility of having blonde hair is specific to one gene (even though it's controlled by many genes)
We can imagine that the gene for having blonde hair is "B", while the gene for not having blonde hair is "b"
You need 2 "B" genes to have blonde hair, as it is a non-dominant gene.
Now, each person has two sets of the gene. There are four possiblities of writing these two genes. "BB", "Bb", "bB", and "bb"
You inherit one set of this gene from each of your parents
An easy way of looking at it is like pic related.
In the first section, the Mother has two blonde genes, and thus, has blonde hair. The Father, however, has one set of dominant non-blonde hair, and non-dominant blonde hair.
The result is a 1/2 chance of the child having blonde hair.
In the second section, both the mother and father have one dominant non-blonde, and one non-dominant blonde hair.
The result is the child having only a 1/4 chance of having blonde hair.
While this child does not have blonde hair, they carry the blonde hair gene.
When this child has children with another person who carries the correct gene sequence, the child of these two have a chance of having blonde hair.
