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Yes, an amniocentesis is necessary.
While both the woman and the husband may not exhibit sickle cell anemia, they could be carriers of the sickle cell recessive gene. If she is heterozygous for sickle cell allele, because of her father, and the man has no recessive gene, then the child has no chance of exhibiting the disease but has a 0.5 chance of being a carrier.
However, if the man is also a carrier, the child has a 0.25 probability of having sickle cell anemia.
The modern theory of evolution states that a basis for variation within a species is provided by mutations. It plays an important role in evolution. The best source of all genetic variation is mutation. It is important as the first step of evolution<span> because it creates a new DNA sequence for a particular gene, creating a new allele.</span>
Answer:
Tendon is a flexible cord of strong collagen tissues that attaches muscles to bones. Tendon gets injured when the tissue fibers gets tear down. These tendons gets swells up after injury and takes lots of time to recover. The doctor will suggest that recovery of the tendons will be long and painfull because of the damage of the tendon fibers.
