1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
g100num [7]
4 years ago
5

Investigator Benton uses several methods to analyze hair samples found at the crime scene. He examines the physical features of

the hairs, their color and shape, as well as
the medulla of the hairs. Using the hair root, he tests for nuclear DNA and also for mitochondrial DNA. Which of these tests would most likely indicate the owner's identity?
Morphology
Medulla
Biology
1 answer:
Diano4ka-milaya [45]4 years ago
6 0

Answer:

Medulla.

By analyzing the DNA extracted from the hair follicle, the medullary index and the pattern of medulla in the hair samples obtained from a crime scene, an investigator can identify the owner.

Explanation:

The hair consists of follicle and shaft. The follicle is the part of the skin, where the hair grows and the hair shaft has three layers: an inner medulla,  a cortex, and an outer cuticle.

The morphology (physical characteristics) of hair provides a broad detail on the racial background of  an individual and an investigator can identify a  group of people who share similar  traits. But the hair without follicle cells attached to it, cannot  be used to identify a specific individual. If the follicle of a hair is present, then it can lead to individual identification by DNA analysis. Also the medulla of animals is larger than that in the humans. By comparing the medullary index (the ratio of the diameter of the medulla to the diameter of the entire  hair), it can be determined if the hair obtained from crime scene belongs to animals or humans. The macroscopic (length, color, and curliness) and  microscopic characteristics ( pattern of the medulla, pigmentation of  the cortex, and types of scales on the cuticle) of the hair samples are studied during a crime investigation. If the entire hair follicle (follicular tag) is present in the hair samples found at the crime scene, the blood and tissue attached to  the follicle is extracted and analyzed using DNA profiling. DNA analysis of the hair follicle provides  an identification with greater accuracy than the hair shaft.

You might be interested in
Which of the following is a possible long-term consequence of two organisms occupying the same niche? a. Local extinction b. Coo
Lemur [1.5K]
Niche refers to the role of the microorganism or a living thing in an ecosystem. When two organisms occupying the same niche, the possible long-term consequence isA. local extinction. This is because the relationship is competition which can outlast the other. Eventually, when the environment is changed, the organisms adapt too which erases the original attributes. 
8 0
3 years ago
Read 2 more answers
Which of the following microscopes has the lowest resolution
zhenek [66]
I believe it is dissecting 
4 0
4 years ago
Did humans cause the drought in São Paulo?
Strike441 [17]

Answer:

São Paulo is a city in Brazil that faced the worst drought in Brazil in the last 100 years between 2014–17.

The reason of the drought was diminished rain falls from last three third consecutive year in the region. Humans were somewhere responsible for the drought and less rainfall because this was caused by expansion of deforestation into the Amazon basin. Deforestation disturbed the environmental cycle that caused less amount of rain in São Paulo, Brazil.

7 0
3 years ago
When farmers leave plant stalks in the field to reduce soil erosion, it is called ____. a. contour farming c. no-till farming b.
aleksklad [387]

Answer:

Option (C)

Explanation:

In no-till farming method, the farmer usually uses a no-till planter with the help of which they make a narrow type of trench that is sufficient enough for the seed to be grown in rows. The residue of the cover crop is allowed to place on the surface of the soil by not plowing, as a result of which the soil is protected from getting eroded and losing of moisture content. This improves soil quality.

This method helps in increasing the water content that percolates down into the soil, holding the organic matter and recycling of nutrient matters. It also expands the growth and population of microbes in the soil, which provides more nutrients to the soil and increases the fertility of the soil.

Thus, when a farmer leaves plant stalks in the field to reduce soil erosion, then it is known as no-till farming.

Hence, the correct answer is option (C).

5 0
4 years ago
Read 2 more answers
Cyanobacteria can cluster together into colonies called _______, with some discovered in Western Australia that are 3.5 billion
Anna [14]

Answer:

1.) stromatolites

2.) photosynthesis

3.) Ordovician

4.) Cambrian

5.) oxygen

6.) As Earth cooled, carbon dioxide dissolved in the early ocean. Cyanobacteria consumed carbon dioxide and converted it to oxygen. Methane was removed from the atmosphere as oxygen was produced, eventually leading to the Cambrian Explosion.

7.) Metabolic processes that use oxygen produce more energy than anaerobic metabolism. Simple diffusion of oxygen would limit the size of a multicellular eukaryote, but animals evolved ways to transport oxygen to their tissues, which permitted an increase in size.

Explanation:

From Penn

7 0
3 years ago
Other questions:
  • Counting tree rings is an example of which type of dating
    8·2 answers
  • Which circumstances could be sources of error within the experiment? Check all that apply
    11·2 answers
  • Which factors contribute to the extinction of a species
    6·1 answer
  • Why does the function of the hormone oxytocin in the progression of labor during childbirth illustrate a positive feedback mecha
    11·1 answer
  • What role does fruit play in an angiosperms life cycle?
    14·1 answer
  • What four pieces of information is included in a providers credentials
    8·1 answer
  • Is any FAP considered an innate behavioral response?
    7·1 answer
  • An adult hemopoietic stem cell found in the bone marrow ______________________. (a) will occasionally produce epidermal cells wh
    11·1 answer
  • 5. In a food web, what is the role of detritivores and decomposers and at what level do
    10·1 answer
  • Complete this sentence. _____ affects the angle of sunlight on Earths surface.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!