What Is the Family's Recurrence Risk?
Take the reading one piece at a time. For each piece: read it once, underline the sentence that says what happens, then look up any word in the list. Tap a word to see its definition.
Piece 1 of 2
Family A has a child with a cleft lip and palate, no lip pits, no other anomalies, and a careful exam of both parents finds no lip pits or clefts, with no other confirmed affected relatives. Everything gathered (a negative syndrome screen, a non-dominant pedigree, a common regulatory risk allele) points to isolated, multifactorial CL/P. Family B is a contrast case: a child has cleft lip plus small lower-lip pits, the father has the same lip pits but no cleft, and the pattern passes through three generations, which fits autosomal dominant Van der Woude syndrome.
Piece 2 of 2
Counselors use different tools for each. For nonsyndromic, multifactorial CL/P they use empiric risk: recurrence percentages measured by following many real families, about 2.5% after one unilateral cleft and about 4.6% after a bilateral cleft lip and palate; first-degree relative recurrence is strongly raised compared with the general population. For an autosomal dominant condition like Family B's Van der Woude, the carrying parent has a 50% chance of passing the variant to each child, but nonpenetrance and variable expressivity mean a child who inherits it may show only lip pits, a full cleft, or rarely nothing visible.
Reading the Research
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Now put it together: In one or two sentences, say what this whole reading is telling you about Mateo. Then go back to the lesson and fill in the guided notes.