how does it work with having the dominant and recesive genes in order to have genetic trait...read ahead....?

Question

my bf has brown eyes, but his mother and sister have blue eyes and from his father's side they are all also blue eyed except for him and his father. so genetically i would preasume that he carries dominant genes in having blue eyes.

i instead, have brown eyes and all of my relatives and family are brown eyed. i have had cousins (brown eyed) that have married brown eye men and have ended up with blue and green eyed kids.

so...

thinking along the lines that i have recessive genes in having blue eyed kids, would that make me possible of having blue eyed kids with my bf if we ever got married and got kids?

or else how does it work with the recessive and dominant thing??

(i studied it in hschool long long time ago how it all worked and forgot, but im curious to know again)

thanks

Answer 1

Blues eyes are recessive. The fact that a lot of your bf family have blue eyes, just means that this gene is very common in his family, but clearly he and his father have one brown dominant allele.
Your family, I'd be inclined to say, have no blue eyes alleles (or gene), since all have brown eyes. But I can't be sure. Your cousins could have blue eyes alleles from the other side of the family, and although their husbands have brown eyes, they certainly carries some recessive allele for blue and/or green. Because blue is a recessive gene, it has to come one from each side of the family.
So answering your question, if you have a recessive blue eye allele (which is possible, but I would think unlikely), there are 50% chance you will have blue eyed children (since your bf certainly have it). If you don't have blue eyes allele, no children will have blue eyes, but there is a 50% chance they will have the blue eyes alleles, and possibly blue eyes grandchildren. This chance decreases in each generation.
However, this is simple genetics application (not that is simple, but it gets more complicated). Sometimes more than one gene influence on one single trait. Because of so many variations of the colors of eyes, I personally believe there is more than one gene in action. So it could be that the crazy mess of genes, you do have blue eyes children. Who knows...

Answer 2

This is a sex-linked gene. We cannot say that your child could end up having blue eyes, brown eyes or green eyes unless we examine the pedigree of your family tree and your BF's family tree. there can also be some factors that would affect the color of your eyes.

Since in highschool we only sudied the mendelian genetics where there is recessive and dominant traits. but viewing this on a non mendelian point of view there is that of codominance etc. that would contradict our expecations regarding the phenotype of your childs eyes.

But in a mendelian point of view. Let's say that being blue - eyed is dominant and your BF is heterozygous. and you are homozygous brown we could say that.... (this is not sex linked)

B - gene for dominant blue
b - brown recessive

BF's Bb x bb your gene
/\
/ \
Bb Bb bb bb

chances are 50% of your child can acquire Blue - eyes and 50% brown eyes. hope i cleared your mind about things...

Answer 3

Blue eyes are recessive.

Remember the 4-square diagram with Dominant and recessive?

in order for your bf to have blue eyes, both of his parents had the recessive trait for blue eyes... like this.

D = Dominant Trait
r = recessive trait

One set for dad, one set for mom

DD Dr
rD rr

Hopes this comes out in the answer.

Anyway you see that there's a 1 in 4 chance of two recessives coming together.

If there's a dominant trait, that 'rules' over the recessive