How'd I end up with blue eyes if my mum's family is completely brown e!
Question: How'd I end up with blue eyes if my mum's family is completely brown eyed?
HOWEVER, I have heterochromia. I was born with one blue eye and one brown eye. Over the years my eye colour has changed (and still is) and now they're mostly a very pale blue with a few little specks of brown.
How is this possible? Nobody in either family has heterochromia, and my sister is blue eyed (she has a different mother though, with blue eyes)
Answers:
Here's a quote from Wikipedia:
"The genetics of eye color are complicated, and color is determined by multiple genes. The once-held view that blue eye color is a simple recessive trait has been shown to be wrong. The genetics of eye color are so complex, that almost any parent-child combination of eye colors can occur."
http://en.wikipedia.org/wiki/Eye_color
I don't see why having your mom's whole family having brown eyes rules out the fact that she go recessive gene for blue eyes. If there is a recessive gene for blue eyes..and her grandparents/parents happened to have brown alleles, then the whole family would still be brown eyed even if one of them (your mom for example) has a recessive blue.
Well as you already know..heterochromia is an uneven amounts of melanin in your eyes.If we were to assume that we're 100% absolutely certain that the WHOLE of your mom's family is pure with brown eye genes then that just means that your melanocytes (melanin cells) are absent in one eye (blue one).However, they are now becoming blue..and if you draw out the diagram the explanation would be that your mom has a blue eye recessive gene or you are losing melanocytes which I'm not sure is possible