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2 years ago

What causes variations in asexual organisms?

1 answer:

7 0

<span>In asexual organisms variation can occur from a variety of sources - mutations, homologous recombination and plasmid transfer. Mutations occur at a rate of roughly one base per million, meaning you would get between 0.1 and 10 in bacteria due to the size of their genomes.

In sexually reproducing organisms there are mutations and the crossing of gametes. The mutations occur in a near identical way to in asexual reproducing organisms as long as they occur in germline cells.

Asexually reproducing organisms reproduce much, much faster and so variation can occur more rapidly. For example the variation in the HIV viral propulation in an individual after 5 years is an immense diversity, higher than all the diversity that the human population has managed in thousands of years.</span>

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Lab: Effects of Human Activity on Freshwater Resources (essay)

Bogdan [553]

Answer:

Our water resources face a host of serious threats, all of which are caused primarily by human activity. They include sedimentation, pollution, climate change, deforestation, landscape changes, and urban growth.

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3 years ago

How do you know that a cheek cell is an animal cell

Gre4nikov [31]

Well, do plants have cheeks? No! So it must be an animal cell!

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3 years ago

Portal blood vessels connect two capillary beds found in the ________. A. hypothalamus and thalamus B. anterior pituitary and po

sdas [7]

Portal blood vessels connect two capillary beds found in the hypothalamus and anterior pituitary.

So, the correct option is C.

<h3>Hypothalamus-Pituitary Complex:</h3>

The "command center" of the endocrine system is assumed to be the hypothalamus-pituitary complex.
In addition to hormones that directly affect target tissues, this complex also secretes hormones that control the production and release of hormones from other glands.
Furthermore, the hypothalamus-pituitary complex controls the communications between the nervous and endocrine systems.
The hypothalamus-pituitary complex is frequently necessary for the translation of a stimulus into hormones that can start a reaction after it is received by the neurological system.
Additionally, the pituitary gland (also known as the hypophysis), a bean-shaped organ hung from the hypothalamus by a stem called the infundibulum (or pituitary stalk), is physically and functionally connected to the hypothalamus.
The sella turcica of the sphenoid bone of the skull serves as a cradle for the pituitary gland.
It has two lobes, the posterior pituitary (also known as the neurohypophysis), which is made of neural tissue, and the anterior pituitary (also known as the adenohypophysis), which is made of glandular tissue.

<h3>Anterior Pituitary:</h3>

The embryonic anterior pituitary develops from the gastrointestinal tract and moves toward the brain as the fetus grows.
The pars tuberalis is a thin "tube" that wraps around the infundibulum, the pars distalis is the most anterior, and the pars intermedia is next to the posterior pituitary.
Neurons secrete hormones from the hypothalamus, but blood arteries transport them to the anterior pituitary.
There is a capillary bridge that links the anterior pituitary and hypothalamus inside the infundibulum.
The hypophyseal portal system is the network that enables the delivery of hypothalamic hormones directly to the anterior pituitary without first passing via the systemic circulation.
The superior hypophyseal artery, a branch of the carotid arteries that carries blood to the hypothalamus, serves as the system's initial point.
The hypophyseal portal system is made up of the superior hypophyseal artery's branches.
The portal veins deliver hypothalamic releasing and inhibitory hormones into the anterior pituitary via a main capillary plexus.
Anterior pituitary hormones enter a secondary capillary plexus in reaction to hormones being released, and from there, drain into the blood circulation.
In the anterior pituitary, seven hormones are produced.
Separate hormones produced by the hypothalamus either promote or suppress the anterior pituitary's capacity to produce hormones.
The hypophyseal portal system is the route by which hormones from the hypothalamus get to the anterior pituitary.
Seven hormones are produced by the anterior pituitary.

Beta endorphin,
prolactin,
thyroid-stimulating hormone (TSH),
adrenocorticotropic hormone (ACTH),
growth hormone (GH),
follicle-stimulating hormone (FSH), and
luteinizing hormone (LH).

Because they regulate the activity of other endocrine glands, the anterior pituitary hormones TSH, ACTH, FSH, and LH are together known as tropic hormones.

Learn more about " Anterior Pituitary ":

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1 year ago

Hydrophones help scientists listen to and record sounds from the ocean. Which statement best describes how ocean water affects s

pishuonlain [190]

Answer:

D. high water pressure increases the speed of sound

Explanation:

7 0

2 years ago

Read 2 more answers

The american bison was once common in the prairie, but now wild bison are rare. Like cows, bison eat grass. What kind of organis

blagie [28]

Bison just like cows eat grass and are known as herbivores.

<h3>What are herbivores?</h3>

Herbivores are animals which eat grass or plants as their food.

Herbivores are primary consumers since they obtain their food from the primary producers, plants.

Examples of herbivores are cows, goats, and bisons.

Therefore, since bison eat grass just like cows, bosons are herbivores.

Learn more about herbivores at: brainly.com/question/1048752

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2 years ago