Mutations affects a gene by A. Changing the sequence of DNA bases in gene. Mutations leads to cancer also.
Answer:
1 - Malaria
2- Typhoid fever and Tuberculosis
Explanation:
In case of malaria, the causal microorganism is Plasmodium falciparum, which target red blood cells of host. In humans who have defective sickle cell allele, have abnomral shaped red blood cells. So microorganism does not able to attach to abnormal shaped RBCs thus humans having sickle cell allele are more resistant to death caused by malaria.
In cystic fibrosis, mutation on that gene which encodes a protein known as cystic fibrosis transmembrane conductance regulator (CFTR).
Normally Salmonella typhi (bacteria responsible for typhoid fever) enters into intestinal cells by attaching with CFTR receptor. Carriers of cystic fibrosis mutant gene, have abnormal CFTR thus reduced rate of entry of bacteria into carriers.
Normally Mycobacterium tuberculosis (bacteria responsible for tuberculosis) adds sulfate in its cell walls. In carriers of cystic fibrosis, arylsulfatase B activity is reduced which incorporates sulfate. Thus reduced arylsulfatase activity makes bacteria unable to add sulfate in its cell walls thus decreases their virulence to carriers of cystic fibrosis.
<span>A statement you believe to be true.</span>
Answer:it begins at conception
Ans terminated at birth.
The entire period takes 9months.
Conceptions begins with the fertilization of the sperm with the Oocyte.It is followed with the implanta tion of tje EMBRYO on the walls of the uterus for supply of needed nutrients and removal of wastes by the mother.The tissues that does this are called collectivly the PLACENTA
Detachment of the placenta from the mother signified labor.
Explanation:
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