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Which of the following trait shows only variation in expressivity?(a) Brachydactyly(b) Osteoporosis imperfectica(c) Pea seed colour(d) PolydactylyI had been asked this question in a job interview.Query is from Penetrance and Expressivity in chapter Regulating Gene Expression in Eukaryotes of Cytogenetics

Answer»

Right answer is (B) Osteoporosis imperfectica

For explanation I would say: In CASE of PEA seed colour the penetrance and expressivity are both 100%. In case of brachydactyly and polydactyly the penetrance varies as WELL as the expressivity. But in the case on osteoporosis imperfectica it is ALMOST 100% penetrant but the expressivity is different.



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