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PIMSO 2022 - Science - Grade 8 - National Round Question 4

PIMSO Science · PIMSO 2022 - Science - Grade 8 - National Round

Question 4

Polydactyly is an anomaly characterized by the presence of extra fingers or toes and is genetically inherited among families. The graph below is a pedigree analysis of the proband (red) who has polydactyl. What is the pattern of inheritance of polydactyly in the proband’s family?
Reference: Wang et al., Scientific Reports 6, 38500 (2016).

Question illustration
  1. Autosomal dominant
  2. Autosomal recessive
  3. X-linked dominant
  4. X-linked recessive
  5. Y-linked