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.
D.) COLORFUL FLOWERS is the structural adaptation that some plants have to attract pollinators.
The more colorful the flowers are, the more insects are attracted to the flowers. Insects would then land on the flowers wherein the pollen in the flower will stick to the body of the insect. Insects are called pollinators. They help in the pollination of the flowers.
Pollination is the transfer of pollen from the flower's anthers to its stigma or another flower's stigma which will start up its fertilization.
Answer:
James Watson, Francis Crick , Maurice Wilkins and Rosalind Franklin
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Answer :
- If the pons of the brain is damaged , it may cause a major interruption,loss of muscle control and function except for the eye movement in the body.
- Pons - Situated in the brain,Sends sensory information like signals through sleep patterns to the organs and muscles.
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