"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDZG-BD6 : 2 March 2020), Alexander Johnson in household of Thomas Johnson, St. Louis, ward 4, St. Louis, Missouri, United States; citing family 1258, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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DNA Connections
It may be possible to confirm family relationships with Alexander by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Alexander: