Kids Brown

Genetically, how do two brown-eyed parents have blue-eyed kids?

I love to tell one of my friends that he and his family just throw Punnet squares right out the window. His mom has blue eyes and blonde hair, his dad has brown eyes and brown hair. My buddy is the only one of 4 kids to have brown/brown-all the other boys are blond/blue. He married a girl with brown eyes and brown hair, and everybody in her immediate family is brown/brown.

My buddy and his wife had a little girl. She’s blonde/blue, looks just like Dad’s brothers and mom! Can somebody break this down for me?

Thanks,
towanda_ajt

Eye colour and hair colour are quantitative traits, which means that they are regulated by the expression of several genes and the Punnet square cannot be applied in a simple way…
We have 3 genes (2 alleles for each, which means actually we have like 6 genes) controlling the eye colour. Imagine it as dark-dark-dark.
The “sum” of these genes determines our eye colour: 6 dark genes means dark-brown eyes, 5 means brown, 4 means brown-green, 3 means green, 2 means dark-blue and 1 means light-blue. When they assort on the spindle and homologous chromosomes have to segregate, it can happen that 2 dark genes from the mother went to one cell (remember we have 6 in total) and 1 dark from the father went to one cell. If you imagine these two cells to fuse (sperm and egg), the little girl got 5 dark genes, resulting in a brown-eyed boy. This is the way iy works. It could be that with 3 dark genes you have blue eyes.The same is true for hair colour.
I hope I helped you.

kids at brown messing around 2

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