Nato, can you explain this to me. I have blue eyes. My mother has blue eyes, my father has brown eyes. I don't have any other full blooded siblings. But my brother (who has the same mother as me) has blue eyes and his father, the Spaniard, had very dark brown eyes. How did my mother's blue eyes trump both of her partner's brown ones to give both of her children blue eyes?
Tim has green eyes. His mother has brown and father has blue. One of his brother's has brown and one has hazel. How does that happen? Again, I'm confused how Tim didn't get brown.
You'll probably explain it to me and I still won't understand! If you are sick of giving genetics classes, feel free to ignore the question.
Girls, is this what I have to look forward to? Yesterday I made granola. I put it in the oven. I set the timer. I washed some dishes and saw that the timer was about to go off in a minute. Normal people would have waited. Not me, in that small time frame of a minute, I walked out of the kitchen and got in the shower. I took a nice long shower. Shaved my legs and everything. I realized the granola was still cooking after I was done. Sure enough, the timer was beeping like mad! Pregnancy brain? Good god! What an idiot!
I dont mind, its no problem
Same as Bleu and Sparkly
The very simple version is this
Your mum has 2 blue eyed genes
The father has 1 dominant dark brown eyed gene, and 1 recessive blue eyed gene which doesnt show physically, but is there albeit recessively. The father has brown eyes cos the brown eye gene is dominant
Your brother has 1 blue eyed gene from your mum, + the recessive blue gene from his dad = 2 x blue eyed genes which present a blue eyes physically.
his parents have the following genes:
Dad: Brown eyes
gene 1 = Brown
gene 2 = blue
Mum: blue eyes
gene 1 = blue
gene 2 = blue
Mix the above genetics together and the possible combinations of children are:
1) Brown blue (brown eyes)
2) Brown blue (brown eyes)
3) blue blue (blue eyes)
4) blue blue (blue eyes)
So those parents have a 50% chance of having a brown eyed baby, and a 50% chance of having a blue eyed baby
Tims family: theres a yellow allele involved because of the green and the hazel eyes, which makes it much more complicated. It sounds like Tim has inherited a recessive green allele from his mum and a blue one allele from his dad, and green is dominant to blue so presents as green eyes. This is where the layers come in as there are more than 2 simple genes at play in both green and hazel eyes. His mum must have more complicated genetics as his fathers are simple blue genetics. His mum has several layers - at least 3, which present in her children as dominant over their fathers, but recessive to their mothers physical brown (hence she has brown) Hazel genetics arent fully understood by geneticists let alone by 1st year undergraduate drop outs like me, but thats as far as i get it. Hazel and grey eyes are actually impossible. Which is where my baby brain implodes
pregnancy brain and genetics dont mix either
ps my green eyes are from my mum, her eyes are brown, but recently turned green. Which i think its a physical rather than genetic issue.