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FS2 - Hair and Fiber
hair and fiber review
Question | Answer |
---|---|
Where is mDNA found? | In the mitochondria |
Which parent can be traced using mDNA? | only the mom |
How many genes are found in mDNA? | 37 genes |
Where is nuclear DNA located? | In the nucleus of a cell |
How many chromosomes are found in normal human nuclear DNA? | 23 pairs or 46 total chromosomes |
What is a hair shaft? | The entire piece of hair, root, shaft, and tip |
What is a hair follicle? | A cup shaped part of the skin where the hair grows |
List the 4 functions of hair | regulate body temperature, protection from sun, reduce friction, sense organ |
How much does an average human hair grow in 1 month? | 1.3 centimeters |
What is the medullary index for an animal? | more than .5 |
What is the medullary index for an human? | less than .33 |
What is direct transfer of hairs or fibers? | When an object is exchanged directly from the source |
What is secondary transfer of hairs or fibers? | When object passes between at least 2 sources. |
How is fur different from hair? | Hair is just primarily the shaft and tip. Fur contains the skin and the hair. |
What part of the plant produces cotton fibers? | the seed |
What part of the plant produces coconut fibers? | the fruit |
What part of the plant produces flax fibers? | the stem |
What part of the plant produces manila fibers? | the leaves |
What part of the plant produces jute fibers? | the stem |
What part of the plant produces sisal fibers? | the leaves |
What part of the plant produces hemp fibers? | the stem |
What type of plant produces coir? | coconut |
What type of plant produces linen? | flax |
What type of plant produces sisal? | cactus |