Oculocutaneous albinism (OCA) is a type of albinism. There are many different forms of OCA.
OCA1A is one form of OCA, caused by a recessive mutation in the autosomal gene, TYR, coding
for the enzyme tyrosinase. This enzyme is involved in the biosynthetic pathway that results in the
production of melanin, the pigment responsible for the colour of hair, skin and eyes.
A person with OCA1A has white hair, very pale skin and pink eye colour.

Q: What topic does this question test?

This question tests Inherited change in A-Level Biology (syllabus code 9700). It is worth 12 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology May/June 2019 examination, Paper 4 Variant 2 (9700_s19_qp_42.pdf).

Question

Oculocutaneous albinism (OCA) is a type of albinism. There are many different forms of OCA.
OCA1A is one form of OCA, caused by a recessive mutation in the autosomal gene, TYR, coding
for the enzyme tyrosinase. This enzyme is involved in the biosynthetic pathway that results in the
production of melanin, the pigment responsible for the colour of hair, skin and eyes.
A person with OCA1A has white hair, very pale skin and pink eye colour.

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