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Hair Growth and Medullary Index Name: ____________________ Date ___________ Period____Answer the following problems; show your work: Growth Rates: 1.25 cm/ month 0.42 mm/dayA hair that is 2.5 cm long is found at the scene of the crime. How many months has this hair been growing?A hair that is 10.92 mm long is found. How many days has this hair been growing?A red hair is found at the scene of the crime. Upon further examination, they see that there are brown roots, about 10 mm long. How many days ago was this hair dyed?A dyed hair sample is found at a murder scene. The hair was dyed blue, but blonde roots are seen. If the length of the hair is 30 cm, and the root length is 13 cm, how many months ago was this hair dyed?Trace amounts of Marijuana are found in a hair at 6.4 mm from the root. How many days ago was this person exposed to Marijuana?Small amounts of a date rape drug were found at 12 cm from the root of a woman’s hair. How many months ago was this woman exposed to this drug?Medullary Index:Human: 0.33 or lessAnimal: 0.5 or greaterCannot be determined: 0.33 – 0.5The medulla of a hair found at a crime scene is 90 um in diameter. The diameter of the hair shaft is 130 um. Calculate the medullary index, and determine if the hair is human or animal.The medulla of a hair found at a crime scene is 30 um in diameter. The diameter of the hair shaft is 180 um. Calculate the medullary index, and determine if the hair is human or animal.The medulla of a hair found at a crime scene is 40 um in diameter. The diameter of the hair shaft is 130 um. Calculate the medullary index, and determine if the hair is human or animal.The medulla of a hair found at a crime scene is 65 um in diameter. The diameter of the hair shaft is 190 um. Calculate the medullary index, and determine if the hair is human or animal.The medulla of a hair found at a crime scene is 23 um in diameter. The diameter of the hair shaft is 161 um. Calculate the medullary index, and determine if the hair is human or animal.The medulla of a hair found at a crime scene is 87 um in diameter. The diameter of the hair shaft is 156 um. Calculate the medullary index, and determine if the hair is human or animal. ................
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