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tiny-mole [99]
3 years ago
7

The point at which two chromatids are attached to each other in a chromosome is called a(n)

Biology
1 answer:
Anvisha [2.4K]3 years ago
7 0
The two chromatids of a chromosome are attached at a point called the centromere<span>. It is the point which it is attached to a spindle fiber during the process of cell division.</span>
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The arctic fox and gray fox evolved from the same species over thousands of years. can you place these steps in the process of a
elena55 [62]
Allopatric speciation, also referred to as geographic speciation, is a method of the formation of new species due to isolation of the species from one another through geographic means.

The first step in this process is geographic isolation, which means that the original population is divided into two groups due to geographical reasons such as movement of continents or formation of water bodies.

Next, the species are subjected to different selection pressures due to their different environments. Eventually, the gene pool becomes very different for the two species due to the different selection pressures and because they are not allowed to mix.

Finally, after enough time passes, speciation occurs, which means that the two populations cannot breed to form fertile offspring.
8 0
3 years ago
Which of these government programs encourage hygiene practices?
Ludmilka [50]

Answer;

B. Water purification programs

Explanation;

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5 0
3 years ago
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An organism has a nucleus and is multicellular but has no cell wall and no chloroplasts.
sergey [27]
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List tim''s symptoms and identify the organ system (or specific organ) associated with those symptoms. (your may need to referen
pantera1 [17]
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2. The thyroid gland is an organ of the endocrine system which is located in the neck, behind Adam's apple. It regulates metabolism, protein synthesis and development. It does so by producing a number of hormones: calcitonin, thyroxine and triiodothyronine. The two thyroid hormones (thyroxine and triiodothyronine) regulate the body's metabolism by controlling the way cells produce and consume energy.

3. Hyperthyroidism is an endocrine condition in which there is an overproduction of thyroid hormones by the thyroid gland. Under these conditions, the thyroid gland proves to be overactive and the main symptom is the acceleration of the metabolism. Tim's sudden increase of growth rate and inability to gain weight, along with his nervousness and mood swings, and his fatigue and loss of energy could indicate a problem of hyperthyroidism.

4. Cortisol is a steroid hormone which is produced by the thyroid gland. It is often called as the "stress hormone" as it is released in response to a stressful situation. It is also released in response to low blood glucose concentration. Some of cortisol's functions are the increase in blood sugar, the suppression of the immune system and bone formation. Cortisol is also involved in the metabolism of macronutrients.
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