Option A
DNA is always synthesized in the 5' to 3' direction, meaning that nucleotides are added only to the 3' end of the growing strand.
The sickle cell pattern based on the family history of Ashleigh isan:
- Autosomal recessive pattern
Based on the given question, we cam see that in the medical history of Ashleigh's family, most of them have had the sickle cell disease which includes her grandmother, one of her uncle's six children has it too, but her father and grandfather did not have the disease.
With this in mind, the inheritance of the sickle cell disease in the family of Ashleigh is one which is autosomal recessive as it affects some people and doesn't affect others because of the pairing of the chromosome which <em>contains the sickle cell trait.</em>
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Read more about sickle cell here:
brainly.com/question/1626483
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