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.
<span>Fever raises the body's temperature to destroy harmful substances. Would be correct.</span>
Answer and Explanation:
The Genotypes is denoted using Uppercase and lowercase letters.
We can use capital H to represent wired hair and lowercase h to represent smooth hair.
___<u>H</u>_____<u>h</u>_____
h HH | hh
_______________
h Hh | hh
_______________
We see that the genotypes are 50% for Wired Hair and 50% for smooth hair.
<u>That means the genotypes for the dog parents are Hh and hh.</u>
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<em><u>#teamtrees #PAW (Plant And Water)</u></em>
Answer:
B. Habitat
Explanation:
Habitat destruction is the process by which natural habitat is damaged or destroyed to such an extent that it no longer is capable of supporting the species and ecological communities that naturally occur there. It often results in the extinction of species and, as a result, the loss of biodiversity.
Correct answer: A). Reciprocal exchange of dna between homologs during prophase i
Homologous recombination is genetic recombination in which the nucleotide sequences are exchanged among the two similar molecules of the DNA. It is used by the cells of the body to repair accurately harmful breaks that occur on the strand of DNA.
Homologous recombination occurs when there is an exchange of genetic material between the two strands of DNA. It usually takes place during the meiosis (Prophase I).
Hence, the correct answer would be option A.
