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Luda [366]
2 years ago
10

State the effect of genetic bottlenecks

Biology
1 answer:
Wittaler [7]2 years ago
8 0

Answer:

<h2> Changes in population size may have important effects on genetic variation and on the survival potential of viral species. Genetic bottlenecks are evolutionary events that reduce genetic variation of a population in a stochastic manner and result in founding populations that can lead to genetic drift.</h2>

Explanation:

<h2>Hopes this helps. Mark as brainlest plz!</h2>
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Chuck Wildlee, a baseball pitcher, was struck on the head by a line drive hit by Charley Hussel. Fortunately, Chuck was not seri
enot [183]

Answer:

Option C, he lost both sensory and short-term memory

Explanation:

Sensory memory is basically the information received by the five sense organs and also the instruction given by brain to the respective sense organ.  

This sensory memory keeps  storing and is collectively referred to as short term memory.  

Since Chuck Wildlee was unable to remember how many balls and strikes the batter had. In past he would have perceived this information through eyes which should have been part of sensory memory and later the part of short term memory.  

Thus, it can be said that Chuck Wildlee lost both his sensory memory and short term memory  

Hence, option C is correct

4 0
3 years ago
Fungi are important to the environment because they
telo118 [61]
B. Break down dead organisms

Fungi are decomposers. they breakdown the bodies of dead organisms. They play a very important role.
8 0
2 years ago
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What are 3 things to know about gravity?
Kipish [7]

Answer:  Gravity is by far the weakest force we know.

Gravity and weight are not the same thing.

Gravity makes waves that move at light speed.

Explanation:  I hope this helps!!

6 0
3 years ago
Which would be an activity conducted by a biologist? *
lakkis [162]
Describe the behavior of brown bats
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3 years ago
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What type and gauge of suture would be used to anastomose a synthetic aortic graft onto an aorta during an abdominal aortic aneu
ikadub [295]

Answer:

Explanation:

There are several approaches and surgical techniques in the reparation of an abdominal aortic aneurysmectomy according to the recent studies. In certain cases, it is recommended to use standard dacron graft with a flexible collar (the collar graft). The other one applies standard dacron graft.

Abdominal aortic aneurysm (AAA) is linked to 1.3% mortality in the male population older than 65-85 years. AAA is defined as the degradation of the elastic media of the previously atheromatous aortic wall. AAA occurs between the aortic hiatus in the diaphragm (T12 vertebra level) and the bifurcation into the common iliac arteries (L4 level). The diameter of the normal aorta varies in the population. In men, it is between 16 to 22 mm.

The most common risk factors for the AAA developing are smoking, male sex, older age, hypertension, hyperlipidemia and previous vascular disease.  

The most common symptoms of AAA are a pain in the abdomen, chest or lower back. The presence of peripheral vascular disease if thrombus formation is present within the aneurysm or mural emboli decrease blood flow to the periphery. In certain individuals, there is a ureteric obstruction due to the compression. The diagnosis is performed by bimanual palpation in the region above the umbilicus. Other diagnostic imaging is necessary most commonly via ultrasound and  CT scan.

Open repair is performed under general anaesthesia. The abdominal cavity is entered via a midline incision, the AAA is detected. Proximal control is provided with the clamp to the aorta (below the renal arteries). The distal control is provided via clamping the common iliac arteries. The aneurysm is opened and any thrombus removed. A graft is anastomosed to either end of the affected region of the aorta. Thus, clamps are removed and blood flow is maintained.

EVAR repair is performed by the stent-graft placement within the aneurysm which requires CT angiography preoperatively. The graft has 2 components, of which both are inserted on catheters under fluoroscopic guidance. EVAR is performed under local anaesthesia with sedation, epidural or spinal block.

The main body of the graft is inserted via the common femoral artery, while the contralateral is then inserted via the other femoral artery. In this way, there is an entirely new lumen for the distal aorta and proximal common iliac arteries.

In the case of an endovascular repair of abdominal aortic aneurysms, total percutaneous access or endovascular aortic aneurysm (EVAR) has been documented. In this approach, the most common material used may be constructed from self-expanding nickel-titanium (nitinol) with polyester graft material. The complications are defined as suture break (separation of adjacent metallic rings) and metal-ring fracture.

The most common postoperative complications are pseudoaneurysm, haematoma,  graft-enteric fistula, suture line disruption.  In case of open abdominal repair, there is always a possibility for a hernia complication and connective tissue disorder.

5 0
3 years ago
Read 2 more answers
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