Question

1. what is the scientific study of hair called? 2. what are the three major types of hair analysis and what are they used for? 3. what is the main protein that makes up hair? 4. what is the medulla? 5. what is the cortex? 6. what is the cuticle? 2. what are the three regions of a hair? 3. what information can the characteristics of these regions tell us about the hair? 4. what information can a microscopic hair examination provide? 5. what kind of instrument is used to analyze hair samples? 6. can all hair samples be tested for dna? explain the criteria required for dna analysis to be done on a strand of hair. site 3: https://www.encyclopedia.com/sports-and-everyday-life/food-and-drink/food-and-cooking/hair-analysis

Explanation:

1. The scientific study of hair is trichology. It examines hair structure, growth, and diseases.
2. The three regions of a hair are the cuticle (outer - protective layer), the cortex (gives hair color and strength), and the medulla (central core, may be absent in some hairs). The characteristics of these regions can tell us about hair texture, color, and integrity.
3. A microscopic hair examination can provide information on hair type, damage, presence of parasites or foreign substances, and can be used in forensic contexts.
4. Instruments like microscopes (light and electron microscopes) are used to analyze hair samples.
5. Not all hair samples can be tested for DNA. For DNA analysis on a hair strand, the hair must have the root attached as nuclear DNA is mainly found in the root cells.
6. The main protein in hair is keratin. The medulla is the central core of the hair which can be continuous, interrupted, or absent. The cortex is the middle layer of the hair that contains pigment granules giving hair color and provides mechanical strength. The cuticle is the outermost layer of the hair, made of overlapping scales that protect the inner layers.

Answer:

1. The scientific study of hair is called trichology.
2. The three regions of a hair are the cuticle, cortex, and medulla.
3. Characteristics of these regions can tell about hair texture, color, and integrity.
4. A microscopic hair examination can provide info on hair type, damage, etc.
5. Microscopes (light and electron) are used to analyze hair samples.
6. Not all hair samples can be tested for DNA. Root - attached hairs are needed for DNA analysis.
7. The main protein that makes up hair is keratin.
8. The medulla is the central core of the hair.
9. The cortex is the middle layer providing strength and color.
10. The cuticle is the outermost protective layer.