What is Sickle cell anemia?
Sickle cell is an autosomal recessive trait of humans that arises through mutation in normal gene. The gene for this trait is found in recessive form and you need two copies of the gene - one from father and one from mother- to have the trait expressed. If the trait is expressed it causes a disease called sickle cell anemia.
People with the sickle cell anemia disease have red blood cells of crescent or sickle shape. The red blood cells of this shape can cause many complications in body. They get stuck in blood vessels and cause pain. They also die quickly and make a person anemic (pale).
Probability to have a child with sickle cell anemia:
If a mother is normal but a father is carrier for the trait, then the situation will be as:
Here N indicate normal allele, S indicate allele for sickle cell anemia.
Mother ˣ Father
NN NS
Gametes: N N N S
Offspring: NN NS NN NS
50% : Normal
50% : Carrier
0% : Sickle cell anemia
It means that 50 % kids will be normal and 50% will be carrier for the trait and none of the offspring will have disease Sickle cell anemia.
However, those who are carriers can carry the disease to the next offspring if they are married to a carrier or a person with sickle cell anemia.
Answer:
Option-D
Explanation:
A plant leaf is a photosynthetic organ of the plant which contains the chlorophyll pigment. The plants have the ability to form new leaves or young leaves when the older leaves shed away.
The younger and older plant leaves can be distinguished on the basis of their color.
The younger leaves as they grow to appear darker due to the presence of higher number of chlorophyll pigments which imparts green color. But as the leaves got older, the color of the leaves changes to yellow as they necrosis leads to the death of the leaves and the anthocyanin pigment imparts yellow color.
Thus, Option-D is the correct answer.
The electron transport chain is located on the inner membrane of the mitochondria, as shown below. The electron transport chain contains a number of electron carriers. These carriers take the electrons from NADH and FADH2, pass them down the chain of complexes and electron carriers, and ultimately produce ATP.
Explanation:
the rule or reasoning I used to determine the change of how an object floats in the water is that paper can't float in water but blocks and others stuff can float.
Lack of light in the depths of the ocean does not mean life does not exist at such depths. Marine biologist have found numerous interesting (and slightly nightmareish) life forms at various depths.
