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german
3 years ago
6

The original population of brown spotted deer declined drastically after their forest habitat was flooded. After frantic efforts

over three decades by the forest authorities to revive the dwindling population, it did bounce back. Now the deer population is as huge as it was three decades ago, but it shows a decreased amount of genetic variations. Which factor could be responsible for this microevolution?
a. Bottleneck effect
b. Natural selection
c. Founder effect
d. Gene flow
Biology
2 answers:
coldgirl [10]3 years ago
7 0
A) Bottleneck effect
Snezhnost [94]3 years ago
6 0
I believe it would be the bottleneck effect. hope that helps =)
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What are the applications of human nervous cells?
Andreyy89

The human body is made up of trillions of cells. Cells of the nervous system, called nerve cells or neurons, are specialized to carry "messages" through an electrochemical process. The human brain has approximately 86 billion neurons. To learn how neurons carry messages, read about the action potential.

Neurons come in many different shapes and sizes. Some of the smallest neurons have cell bodies that are only 4 microns wide. Some of the biggest neurons have cell bodies that are 100 microns wide. (Remember that 1 micron is equal to one thousandth of a millimeter!).

Neurons are similar to other cells in the body because:

Neurons are surrounded by a cell membrane.

Neurons have a nucleus that contains genes.

Neurons contain cytoplasm, mitochondria and other organelles.

Neurons carry out basic cellular processes such as protein synthesis and energy production.

However, neurons differ from other cells in the body because:

Neurons have specialize cell parts called dendrites and axons. Dendrites bring electrical signals to the cell body and axons take information away from the cell body.

Neurons communicate with each other through an electrochemical process.

Neurons contain some specialized structures (for example, synapses) and chemicals (for example, neurotransmitters).

The Neuron

neuron

One way to classify neurons is by the number of extensions that extend from the neuron's cell body (soma).

bipolar neuron

Bipolar neurons have two processes extending from the cell body (examples: retinal cells, olfactory epithelium cells).

Pseudounipolar cells (example: dorsal root ganglion cells). Actually, these cells have 2 axons rather than an axon and dendrite. One axon extends centrally toward the spinal cord, the other axon extends toward the skin or muscle.

Multipolar neurons have many processes that extend from the cell body. However, each neuron has only one axon (examples: spinal motor neurons, pyramidal neurons, Purkinje cells).

Neurons can also be classified by the direction that they send information.

Sensory (or afferent) neurons: send information from sensory receptors (e.g., in skin, eyes, nose, tongue, ears) TOWARD the central nervous system.

Motor (or efferent) neurons: send information AWAY from the central nervous system to muscles or glands.

Interneurons: send information between sensory neurons and motor neurons. Most interneurons are located in the central nervous system.

Check out the Gallery of Neurons to see some pictures of real neurons or "Sidewalk Cells" to see photographs of neurons on the street.

Hear It

"Neuron" | "Axon" | "Dendrite" |

"Nissl" | "Mitochondria" | "Endoplasmic reticulum"

There are several differences between axons and dendrites:

5 0
3 years ago
Many congenital neurologic abnormalities can be prevented by the mother taking _______ before conception and during early pregna
horrorfan [7]

Answer:

Folic acid

Explanation:

The congenital neurologic abnormalities refer to the abnormalities which are present in the infant at the time of the birth like neural tube defects in the given question.

There could be many factors responsible for this like consumption of drugs and alcohol, exposure to mutagens or carcinogens, inadequate amount of folic acid and many others.

Folic acid is a type of Vitamin B which is involved in the production of new cells so are advised to the pregnant lady during and before conception. Consumption of folic acid reduces the chances of birth defects.

Thus, Folic acid is the correct answer.

8 0
3 years ago
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kozerog [31]

A replication bubble forms as the DNA unwinds.

Option C  

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DNA unwinding is the first step in replication or transcription of the DNA molecule. DNA helicase separates the two types of "DNA" that are connected by hydrogen bonds with the help of ATP hydrolysis.  

5 0
3 years ago
Why do scientists study index fossils?
aalyn [17]
Scientist study index fossils so they will get an understanding of what life was like back then.
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Carbohydrates have three different types of building blocks that differ in their
kow [346]
Where are the choices?
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