My+Family+Tree+Pedigree

We all made a family tree as our model to demonstrate a pedigree of genetics. A pedigree is ancestral line, or a genealogical chart. In my pedigree, I included all of my blood-realatives, including my grandmas, grandpas, parents, uncles, aunts, cousins, and myself. Overall, there are 20 people in this tree. Each family memeber is wearing one of four colors because it's based on their eye color. Most people in my family have blue eyes, but some have hazel and brown, and one person has green. By having the relative wear that color, it shows what color eyes they have. Most people in my family have blue (11 people) eyes, which explains why I also have blue eyes. This is genetics. A pedigree is useful when studying genetics because you can make it a family tree, and once you pick a trait for each person for that family tree, you can see all the DNA of each memeber and what was passed on and what were the more dominant and recessive traits. In my pedigree, blue eyes is the more dominant trait because it's the more common color. A little bit more then half of the memebers in my family have blue eyes, while 5 have brown, 3 have hazel, and one has green. Brown, hazel, and green are the more recessive traits, and it was more unlikely I would end up with any of those color eyes. Pedigrees are really good models to show you your gentic history and where you got different traits.

STEP 1: Figure out what color is dominant and what color is recessive. Blue is the recessive eye color, and hazel is the dominant eye color. We figured this out by using a chart that helps us identify whether a trait is dominant, recessive, or unknown. We start with the grandparents. When the trait for the pair of grandparents is the same, you have to figure out whether the trait is unknown or recessive by seeing the color in the offspring. If the color in the offspring is the same, the trait is unknown. If the colors in the offspring are different, the trait is recessive. So for the McManus family, both grandparents have the same eye color, and the color is the same in the offspring, so blue color eyes is an unknown trait. Now if the granparents are a different color, then the color that appears most in the next generation is the dominant trait. So in the Imhof family, the eye color of the grandparents is different, and out of green and hazel, hazel shows up more, so that is the dominant trait.

STEP 2: Place the parents genotype and spread to the offspring. Since we did not know what the recessive trait was, we did some more research on the relatives in the McMnanus family, and found that blue is actually the recessive trait. So rr is the genotype for blue colored eyes, and Rr is the genotype for the hazel colored eyes. rr is the blue eye color because it is recessive, and there is one capitol "R" in the genotype for hazel colored eyes because it is the dominant trait, and then there is a lower case "r" next to it because it needs a letter from the other parent, too, to make the results possible.

STEP 3: Use a punnett square to determine if results are possible. Rr is Parent 1, and rr is parent 2.



STEP 4: Is the parent's genotype Homozygous dominant Homozygous recessive, Heterozygous dominant, or Heterozygous recessive? Parent 1:Heterozygous dominant Parent 2: Homozygous recessive