Please forward this error screen to 216. Further documentation is available here. Pedigree Science Project: Investigate how human traits exploring personal genomics pdf inherited, based on family pedigrees in this Genetics Science Project.
Please enter a search term in the text box. Some characteristics, like the shape of your hairline or whether your earlobes are attached or detached, are inherited from your parents. Use pedigree analysis to determine how several human physical traits are inherited. Science Buddies, 28 July 2017. Pedigree Analysis: A Family Tree of Traits. Share your story with Science Buddies! Please log in and let us know how things went.
Do you have the same hair color or eye color as your mother? Do people say you look just like your grandfather when he was your age? When we look at members of a family it is easy to see that some physical characteristics or traits are shared, but what are the rules that govern the inheritance of these traits? It was Gregor Mendel, an Augustinian friar and scientist, who first discovered in the 1860’s that some traits are passed down from generation to generation, in very clear and predictable patterns. Many genes come in several different versions, called alleles. DNA sequence of the gene.
Mendel first studied— are due to a single gene. He took a true-breeding purple flowered plant and crossed it to a true-breeding white flowered plant and saw that the offspring all had purple flowers. The purple allele was dominant— a single copy of that allele was sufficient. He then took these offspring and crossed them to one another.
He found that their offspring occasionally had white flowers. The offspring that inherited the white allele from both parents displayed the white phenotype. Two heterozygous parents displaying the dominant phenotype can give rise to offspring with either the dominant or the recessive phenotype depending on which alleles the offspring inherit. Two pedigree examples are shown in Figure 2 below. In order for scientists to understand each other’s pedigrees, they use a standard set of symbols and notations.
For example, males are always designated by a square and females are always designated by a circle. Here are two pedigrees showing the same three generations of a family. A specific trait is shown as a solid black circle or square. The pedigree on the left is an example of a dominant trait in this family. The pedigree on the right depicts a recessive trait. In this genetics and genomics science project, you will create pedigrees for four human physical traits to determine which phenotypes are dominant and which are recessive.
See Figure 3 below for an example of each. This diagram shows the difference between detached earlobes and attached earlobes. Some people’s hairlines come to a V-shaped point above their forehead. See Figure 4 below for an example.
Do you have one or not? Here is an example of a straight hairline versus one with a widow’s peak. Take a look at your hands. Do you have little hairs on your second joints, also called the mid-digits?
This photograph shows where mid-digits on a hand are. Some people have tiny mid-digit hairs while other people have no hairs on their mid-digits. This person has no mid-digit hair. Make a fist with your thumb sticking up.