DNA
The function of DNA is
DNA is your genetic code. Your instructions for all your physical striations and functions
Hair is a type of what evidence
Class evidence
Function of the medulla
Controls autonomic functions of the body
Overall
Class
Imbricate hair belongs to ?
Humans
look like close small dots
DNA is what kind of evidence?
Individual
Describe the structure of hair.
Human hair consists of a follicle and a shaft
Function of the cortex
thickest layer
contains most pigment
Denser near cuticle
If hair has follicle
Individual
Cornal
Mouse
looks like flower pedals
What is STR
short tandem repeats
usually 2-5 base pairs long that repeat many times.
A hair shaft is made up of three layers...
Inner medula, cortex, outer cuticle
Function of the cuticle
transparent outer layer of the shaft.
Medullary index of humans
.33 or less
Spinous
Cat
looks like "batman with arms up"
DNA function
DNA structure
DNA is your genetic code, the instructions to make all your physical structures and functions
DNA code is made up of the same four bases repeated over and over in different patterns
What is a cuticle?
a transparent outer layer of the hair shaft.
Scales point from scalp to end
Function of hair
Regulate body temperature
Decrease friction
Protects against sun
Acts as sense organ
Animals
.50 or more
Hair can be used in a forensic investigation because..?
It can link a hair found at the crime scene to the suspect in question
Base Pairing Rule
Adenine goes to thymine VICE VERSA
Guanine goes to Cytosine VICE VERSA
How do you calculate the medullary index?
MI= width of medulla/ width of cortex
Distinguish hair from individuals belonging to broad racial categories
Broad racial categorization can be made by identifying certain characteristics of hair.
THESE CHARACTERISTICS MAY NOT BE APPLICATBLE TO ALL INDIVIDUALS IN THIS CATEGORY.
INDIVIDUAL HAIRS CANT BE ASSIGNED TO A RACIAL GROUP