CGL Genetic Genealogy 2

Question 1

What is 'chromosome painting' in genetic genealogy?

Accepted Answer

A visual representation showing which ancestral populations or ancestors contributed to specific chromosome segments

Answer

Chromosome painting assigns colors to chromosomal segments to visually indicate which ancestral population or specific ancestor contributed each portion of an individual's DNA.

Question 2

If two of your DNA matches share DNA with you but do not share DNA with each other, what does this most likely indicate?

Accepted Answer

They are on opposite sides of your family (maternal vs. paternal)

Answer

When two matches share DNA with you but not with each other, they most likely descend from different family lines — one maternal and one paternal.

Question 3

What is 'triangulation' in genetic genealogy?

Accepted Answer

Confirming a segment is IBD when three or more matches share it at the same chromosomal location with each other

Answer

Triangulation confirms that a DNA segment is truly identical by descent when three or more individuals all share that same segment with one another on the same chromosome.

Question 4

What does 'phasing' refer to in DNA analysis?

Accepted Answer

Separating an individual's maternal and paternal chromosomal contributions

Answer

Phasing is the analytical process of determining which DNA segments came from each parent, effectively separating chromosomes into their maternal and paternal components.

Question 5

A DNA match shares approximately 1,800 cM with you. Which relationship category does this amount most likely represent?

Accepted Answer

Half-sibling, grandparent, or aunt/uncle

Answer

Approximately 1,800 cM is consistent with a close relationship such as a half-sibling, grandparent, grandchild, aunt, or uncle, which typically range from about 1,300–2,300 cM.

(CGL) Certified Genealogical Lecturer Practice Test

(CGL) Certified Genealogical Lecturer Practice Test

CGL Genetic Genealogy 2