Five-Part Series on Visual Phasing:
- Part I – Explaining visual phasing and identifying/labeling recombination points (November 21, 2016)
- Part II – Assigning segments of DNA (November 22, 2016)
- Part III – Using cousin matches to identify which grandparent provided the segments
- Part IV – Mapping my own chromosome using the visually phased paternal chromosomes
- Part V – Using the mapped DNA with new matches
In “Visual Phasing: An Example (Part I),” we identified and labeled all of the recombination points in the three siblings, Susan, Brooke, and Felix:
In Part 2 of the series, we’ll use the identified and labeled the recombination points to assign segments of DNA to the four grandparents.
Step 3 – Fill in Chromosomes
The next step is to fill in the chromosomes using the identified recombination points. We’re going to start with the fully identical region shared by Susan and Brooke, shown in the red square in the next image. We can fill into both chromosomes for Susan and Brooke (the blue and purple segments):
Each of the blue and purple segments is one of the following segments: (i) paternal grandfather; (ii) paternal grandmother; (iii) maternal grandfather; or (iv) maternal grandmother. We’ll try to figure out which is which later.