Answer: Women are carriers for the disease hemophilia because hemophilia is an X-linked disease. The recessive allele for the disease is found on the X chromosome.
The sons of carrier women get hemophilia because males have one X chromosome and one Y chromosome. The sons of a carrier woman may inherit the affected X chromosome from their mother, and a Y chromosome from their father. They have only one X chromosome and one it's affected, will result in hemophilia.
Explanation: Women are carriers because in most cases, only one of their two X chromosomes are affected. The two female X chromosome is rarely affected.
Daughters of carrier women will not get the disease because they need two affected X chromosomes to manifest the disease. So even if they inherit one affected X chromosome from their mother, the second X chromosome they will inherit from their father will be normal. Therefore, daughters of carrier women can only be carriers.
Answer:
Darwin and Lamarck were both scientists who tried to understand evolution. ... Darwin's theory became accepted because it had more evidence that supported it. Lamarck's theory suggest that all organisms become more complicated over time, and therefore doesn't account for simple organisms, such as single-cell organisms.
Explanation:
Answer:
fully oxygenated blood returning to the amphibian heart can undergo additional pumping to reach higher pressures.
Explanation:
Fishes have a two-chambered heart with one atrium and one ventricle. The blood is pumped from the atrium into the ventricle. Ventricle pumps blood into a single circuit of blood vessels. Blood is oxygenated as it passes through capillaries in the gills. As blood circulates through the gill capillaries, it has low blood pressure and therefore, is delivered very slowly to the other organs.
The amphibian heart has two atria and one ventricle. A sinus venosus collects oxygen-poor blood and pumps it into the right atrium. Oxygenated blood from the lungs passes directly into the left atrium. The left atrium pumps the oxygen-rich blood into the arteries that conduct it to the various tissues of the body. Therefore, a three-chambered heart in reptiles allows the delivery of oxygenated blood with high blood pressure.
Answer: I should continue the exercise of upper arm as soon as I reach home.
Mastectomy is the removal of breast due to cancer or for the prevention of cancer. After this surgery there is a placement of plastic tube in order to collect the fluid so as to prevent infections. In this case just after the surgery the person should be engaged in exercises.
The person should not take part in any of the upper body movement as exercises, lifting heavy weights and any other activity which stresses the upper arm.
As long as the person is continuing the dressing she should not engage himself in any exercise.
