![]() Grandmother (bb) x grandfather (BB) (parental) but you don't know your genotype, so you trace the pedigree. Well the woman has 100% chance of donating "b" -> blue. What are the chances of you having a child with blue eyes if you marry a blue-eyed woman? Your mother has brown eyes, but your grandmother(mom's mom) had blue eyes. Again your mother is heterozygous Brown eyed (Bb), and your father is (bb).ĮXAMPLE: You don't know genotype, but your father had brown eyes, and no history of blue eyes (you can assume BB). It gets a little more complicated as you trace generations, but it's the same idea. ![]() Mendel's laws dictate that it will be random, and therefor, you have a 50% chance of brown eyes (Bb), and 50% blue eyes (bb). Since your father can only pass a "b", your eye color will be completely determined by whether your mom gives you her "B" or her "b". If your mother is heterozygous with Brown eyes (Bb), and your father is homozygous blue eyes (bb), the probability that their child (you) would have blue eyes is only dependent on your mother. In terms of calculating probabilities, you just need to have an understanding of that (refer above). Your mother could have inherited one small b and still had brown eyes, and when she had you, your father passed on a little b, and your mother passed on her little b, and you ended up with blue eyes. ![]() How is this possible if your Mom has Brown eyes, and your dad has blue, and Brown is dominant to blue? Well examining your pedigree you'd find out that at least one of your relatives (say your great grandmother) had blue eyes "bb", but when they had a kid with your "BB" brown great-grandfather, the children were heterozygous (one of each allele) and were therefor "Bb". But let's also assume YOUR eyes are blue. He would have gotten both a little "b" from his mom, and from his father. Since blue eyes are recessive, your father's genotype (genetic information) would have to be "bb". So Grandpa and grandma have Brown eyes, and so does your Mom. if you choose eye color, and Brown (B) is dominant to blue (b), start by just writing the phenotype (physical characteristic) of each one of your family members. (If you understand pedigrees scroll down to the second paragraph haha) A pedigree is basically a family tree with additional information about a (or a few) certain trait.
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