_____ is triggered by degeneration of dopamine-producing neurons in the brain.

1 answer:

5 0

Parkinson’s disease is triggered by degeneration of dopamine-producing neurons in the brain. Parkinson's disease is a neurodegenerative disease of the CNS resulting from degeneration of dopamine-producing neurons in a region of the midbrain called the substantia nigra. Some of the factors that induce this disease are oxidative stress, inflammation, and dysfunctional mitochondria. The disease is progressive including characteristic symptoms such as tremors, muscle rigidity, loss of coordination bradykinesia (slowness and difficulty with movements), sleep disturbances...

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Of 2,872 persons who had received radiation treatment in childhood because of an enlarged thymus, cancer of the thyroid develope

Goryan [66]

Answer: People who have received radiation treatment are 15 times more likely to develop benign thyroid tumors relative to does who have not.

Explanation:

Relative risk of benign thyroid tumor = (52/2872)/(6/5055)

= 0.018/0.0012

= 15

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2 years ago

Which map symbol is associated with extremely low air pressure?

ankoles [38]

Answer:

A red "L" is a symbol for low air pressure.

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You are an almond grower and want to determine whether almond size (measured as shelled almond weight) is a heritable trait. A s

inn [45]

Answer: 1. S = 0.77

2. R = 0.14

Explanation:

1. Selection differential is the difference between the population mean and the average of the selected parents. Its symbol is S.

S = mean of selected parents - population mean

S = 6.48 - 5.71

S = 0.77

2. Response to Selection is how much gain you make when crossing over selected parents. Its symbol is R.

R = mean of offspring of selected parents - population mean

R = 5.85 - 5.71

R = 0.14

3. Heritability is, basically, a statistical variable that shows how much the variation in a trait is due to genetic factors. Its symbol is h².

To calculate it, use Breeder's Equation:

R = h²S

$h^{2}=\frac{R}{S}$

$h^{2}=\frac{0.14}{0.77}$

h² = 0.18

4. You would expect the production to be strongly influenced by environment, because heritability lies between 0 and 1. Low heritability means there is low level of resemblance between offspring and parents. As this program heritability is low, the resemblance is small, which means the characteristics are influenced mostly by the enviroment.

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2 years ago

How does photosynthesis in a purple bacterium (Class Anoxyphotobacteria) differ from photosynthesis in an oak tree?

VladimirAG [237]

It differs due to the life cycle of each tree, and the very specific way the trees go.

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2 years ago

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The levels of CO2 have significantly decreased since the

rodikova [14]

Answer:

False; The levels of carbon dioxide have significantly increased since the industrial revolution.