PART A: 1.  Describe one hypothetical situation that illustrates the “use it” po

PART A:
1.  Describe one hypothetical situation that illustrates the “use it” portion of the use it or lose it principle. Provide a description of the situation/behavior and an explanation for why more bone is present under these circumstances.
2.  Describe one hypothetical situation that illustrates the “lose it” portion of the use it or lose it principle. Provide a description of the situation/behavior and an explanation for why less bone is present under these circumstances.
PART B:
*** Use your own body (in anatomical position) to identify the following bones and features of the skeleton. Name the specific bone(s) [and feature(s) if possible] for each.***
1. your chin
2.  the dip at the bottom midline of your neck between your two collarbones
3. the tip of your elbow
4.  the sides of your elbow
5.  the protrusion or ridge at the front and top of your hips
PART C:
1.  While most human traits are polygenic, the traits in the chart on p. 72 of your lab manual have traditionally been considered Mendelian traits. More recent research has disputed the single-gene nature of some of these traits, but for the purpose of this exercise, assume that the traits discussed in this exercise are Mendelian.
Work to determine your own phenotypes and possible genotypes for these traits. (Note: Refer to the table on p. 62 of your lab manual for images of these traits.)
A “cleft chin” is a chin with a slight indentation in the middle. A cleft chin is a dominant trait. What is your phenotype and possible genotype(s) for cleft chin?
2.  Freckles are a dominant trait. What is your phenotype and possible genotype(s) for freckles?
3.  “Attached earlobes” are earlobes that are fully attached to the side of the head, unlike unattached earlobes, which have a lower section that hangs freely away from the side of the head. Attached earlobes are a recessive trait. What is your phenotype and possible genotype(s) for attached earlobes?
4.  A “hitchhiker’s thumb” is a thumb that bends backwards when fully extended from a hand that is closed in a fist. Hitchhiker’s thumb is a recessive trait. What is your phenotype and possible genotype(s) for hitchhiker’s thumb?
5.  A “widow’s peak” is a hairline that dips down in the middle of the forehead to form a V-shape, unlike a non-widow’s-peak hairline, which runs horizontally straight along the forehead. A widow’s peak is a dominant trait. What is your phenotype and possible genotype(s) for widow’s peak?