Answer:
Polycythemia Vera
Explanation:
Polycythemia Vera can be described or known to be a type of blood cancer. And its effect is that, it makes the bone marrow to make or produce too many red blood cells, which can thicken the blood, slowing its flow, and can cause serious problems, such as blood clots, strokes, weakness among others.
Some of the symptoms of Polycythemia vera are
* Headaches, dizziness, and weakness.
* Shortness of breath and problems breathing while lying down.
* Feelings of pressure or fullness on the left side of the abdomen due to an enlarged spleen (an organ in the abdomen)
* Double or blurred vision and blind spots.
In conclusion, it should be understood that there is no cure for polycythemia vera. And treatment only focuses on reducing the risk of complications.
Answer:
The correct answer is A.
Explanation:
Diffusion is the net movement of a substance from a region of higher concentration to a region of lower concentration. The difference in concentration between two environments creates a concentration gradient which is what drives diffusion. Therefore, this movement does not require aid such as extra energy molecules for active transport or integral membrane proteins for directed movement, hence the answer is not B nor C. If the cell is in equilibrium with its environment, it means that the concentration of substances inside the cell is equal to the concentration outside the cell, and any movement that takes place will be random movement of substances across the plasma memberane. Movement in the cell will not cease as the cell is still active. Therefore, the answer cannot be D either.
The plant diversity decrease making that plant existence extinct
Answer:
a. Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.
Explanation:
Tay-Sachs, which is a recessive lethal disease ---- Let say the recessive lethal diseases is s
∴ it only results when an individual posses two copies of the diseases-causing allele i.e two copies of the disease will be ss.
Now, when two hetrozygous individuals crossed , it is obvious that each can pass on their copy of the disease-causing allele to the offspring.
Let show an illustration for the above statement.
Let the heterozygous individual be Ts, if Ts cross with another Ts;
we will have:
Ts × Ts
T s
T TT Ts
s Ts ss
the offspring are TT,Ts,Ts,ss
We can now see how the Heterozygous individuals pass on their copy of the disease-causing allele to the offspring (Ts).
Explanation:
The major blood vessels that are connected to the heart include the aorta, the superior vena cava, the inferior vena cava, the pulmonary artery (which takes oxygen-poor blood from the heart to the lungs, where it is oxygenated), the pulmonary veins (which bring oxygen-rich blood from the lungs to the heart) and the coronary arteries (which supply blood to the heart muscle).
