Relate an autosomal enzyme-gene mutation to impaired phenylalanine metabolism and the recessive inheritance pattern.
Tę umiejętność sprawdzają 3 zadania wzorowane na arkuszach IB z lat 2023–2026.
Biologia IBPaper 2, maj 2026, TZ1wzorowane16 pktotwartetrudne (szac.)
An unaffected couple has a child with phenylketonuria, an autosomal recessive disorder. Use P for the functional allele and p for the recessive allele. Other parts concern respiratory defence and gas exchange. (a) Describe how the disorder can be inherited in…
Biologia IBPaper 2, specimen 2025wzorowane16 pktotwarteśrednie (szac.)
Changes in genetic material can have different consequences. (a) Outline how mutations can contribute to cancer. (b) Outline one human disease caused by an autosomal recessive allele. (c) Explain the role of mutation in evolution. One additional mark is…
Biologia IBPaper 3, maj 2023, TZ1wzorowane3 pktotwarteśrednie (szac.)
Explain why a protein-rich diet may be unsuitable for an adult with phenylketonuria (PKU).