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  2. Overdominance - Wikipedia

    en.wikipedia.org/wiki/Overdominance

    Overdominance is a phenomenon in genetics where the phenotype of the heterozygote lies outside the phenotypical range of both homozygous parents. Overdominance can also be described as heterozygote advantage regulated by a single genomic locus, wherein heterozygous individuals have a higher fitness than homozygous individuals.

  3. Chromosome - Wikipedia

    en.wikipedia.org/wiki/Chromosome

    A chromosome is a package of DNA with part or all of the genetic material of an organism.In most chromosomes, the very long thin DNA fibers are coated with nucleosome-forming packaging proteins; in eukaryotic cells the most important of these proteins are the histones.

  4. Sickle cell retinopathy - Wikipedia

    en.wikipedia.org/wiki/Sickle_cell_retinopathy

    Proliferative sickle retinopathy is the most severe ocular complication of sickle cell disease. Even though PSCR begins in the first decade of life, the condition remains asymptomatic and unnoticed until visual symptoms occur due to vitreous hemorrhage or retinal detachment.

  5. Genetic history of Africa - Wikipedia

    en.wikipedia.org/wiki/Genetic_history_of_Africa

    West Africans (e.g., Mende of Sierra Leone), bearing the Senegal sickle cell haplotype, [111] [96] may have migrated into Mauritania (77% modern rate of occurrence) and Senegal (100%); they may also have migrated across the Sahara, into North Africa, and from North Africa, into Southern Europe, Turkey, and a region near northern Iraq and ...

  6. Genetic studies on Arabs - Wikipedia

    en.wikipedia.org/wiki/Genetic_studies_on_Arabs

    Genetic studies on Arabs refers to the analyses of the genetics of ethnic Arab people in the Middle East and North Africa.Arabs are genetically diverse as a result of their intermarriage and mixing with indigenous people of the pre-Islamic Middle East and North Africa following the Arab and Islamic expansion.

  7. Human genetic clustering - Wikipedia

    en.wikipedia.org/wiki/Human_genetic_clustering

    A wide range of methods have been developed to assess the structure of human populations with the use of genetic data. Early studies of within and between-group genetic variation used physical phenotypes and blood groups, with modern genetic studies using genetic markers such as Alu sequences, short tandem repeat polymorphisms, and single nucleotide polymorphisms (SNPs), among others. [11]

  8. Genetic disorder - Wikipedia

    en.wikipedia.org/wiki/Genetic_disorder

    Gene therapy refers to a form of treatment where a healthy gene is introduced to a patient. This should alleviate the defect caused by a faulty gene or slow the progression of the disease. A major obstacle has been the delivery of genes to the appropriate cell, tissue, and organ affected by the disorder.

  9. Hemoglobin - Wikipedia

    en.wikipedia.org/wiki/Hemoglobin

    Hemoglobin SC disease – A compound heterozygous form with one sickle gene and another encoding hemoglobin C. Hemoglobin Hopkins-2 – A variant form of hemoglobin that is sometimes viewed in combination with hemoglobin S to produce sickle cell disease.