Inhertance of eye color
I have got a query about how genes are transmitted from
parents to kids.
The situation is: I am blue eyed, my mother is green eyed
and my dad is brown eyed. This far so good, no problems: I thought,my mum is
green(G)-blue(b) and my dad is brown(B)-blue, so I had 1 out of 4 of turning
out being blue. It’s normal because there are plenty of blue eyed people in my
family.
The problem is…just that. From my dad’s side, his father
was brown and his mum green(her father blue,her two siblings blue). If my
father had to pass blue to me and I’m a male, I’m getting his genes from the Y
half of his dna ‘staircase’ (the chromosomes 15 and 19-or even others-carrying
the color info are autosomal,different from the Y(number 23),but ‘on the Y
half’ of the dna chain I mean).
Therefore, he’s got blue on his ‘Y half’, but his mum could
only pass green or blue to his ‘X half’, therefore my father should be green or
blue, but never brown(he’s dark brown,not even hazel or amber).
1)What’s wrong with my reasoning?
2)Did some genes from the X side ‘swap’ with the
corresponding ones on the ‘Y side’ in my father(eye colour, etc.)?(at
fertilization when my dad was ‘produced’?, at generation of his spermatozoos?
3)If this happens or whatever it is,what’s roughly the
likeliness for this to happen?(much less than a 1/4th I guess!)
4) Should I infer from all this my father is not my
biological father?
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