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Scientific Foundations of Genealogy

Genealogy

A rigorous examination of genetic genealogy, autosomal DNA inheritance, and biological ancestry markers.

genetics dna ancestry science

10 Questions Hard Ages 18+ Apr 24, 2026

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This study set covers Genealogy through 10 practice questions. A rigorous examination of genetic genealogy, autosomal DNA inheritance, and biological ancestry markers. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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1 Which specific human chromosome is utilized to trace the patrilineal ancestry through unbroken male-to-male inheritance?

A Autosome 21
B X Chromosome
C Y Chromosome
D Mitochondrial DNA

2 In genetic genealogy, what is the term for the process where homologous chromosomes swap segments during meiosis, potentially obscuring ancestral DNA segments?

A Recombination
B Translocation
C Nondisjunction
D Deletion

3 What is the approximate rate of mutation (per generation) for Y-chromosome Short Tandem Repeats (STRs) used in forensic and genealogical matching?

A 1 in 10,000
B 1 in 500
C 1 in 20
D 1 in 100,000

4 Which form of DNA is inherited exclusively from the maternal line and is characterized by a high mutation rate in the hypervariable region?

A Nuclear DNA
B Mitochondrial DNA
C Ribosomal DNA
D Chloroplast DNA

5 What statistical measurement in centimorgans (cM) denotes the total length of shared DNA segments between two individuals, used to estimate their biological relationship?

A LOD Score
B Identity by Descent (IBD)
C Hardy-Weinberg Equilibrium
D Linkage Disequilibrium

6 Why are autosomal DNA tests generally limited to predicting relationships accurately only up to the fifth or sixth cousin level?

A The X chromosome is too small
B DNA segments become too short and fragmented to distinguish from background noise
C Mitochondrial DNA interference
D Y-chromosome drift

7 What is the phenomenon known as 'pedigree collapse' in genealogical research?

A The total loss of historical records
B When ancestors appear in more than one lineage, reducing the number of unique ancestors
C The extinction of a specific surname line
D The rapid degradation of ancient DNA samples

8 Which genetic marker is used to identify specific haplogroups, representing ancient population migrations?

A Single Nucleotide Polymorphisms (SNPs)
B Introns
C Exons
D Epigenetic methylation

9 The concept of 'genetic entropy' in genealogy refers to which biological reality?

A The accumulation of deleterious mutations over many generations
B The loss of surname information
C The inability to track ancestors past 500 years
D The bias in historical record keeping

10 Which type of inheritance pattern do the 22 pairs of non-sex chromosomes follow in genealogical DNA testing?

A Uniparental
B Autosomal
C Mitochondrial
D Holandric

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