(a(i))[1]
Name the part indicated by X.
(a(ii))[2]
Describe one way the structure of X is connected to its function.
(a(iii))[1]
Name layer Y.
(b(i))[1]
Name structure Z.
(b(ii))[4]
Layer Y has no blood vessels. Explain how the blood vessels in the choroid layer are important for layer Y.
(c)[4]
When bright light is shone into the eye, a pupil reflex makes the pupil become smaller. Explain how named parts of the eye and the nervous system take part in this pupil reflex.
(d(i))[4]
Complete the genetic diagram so that the possible genotypes and phenotypes of the children are shown.
(d(ii))[1]
State the probability of these two people having a child who does not make melanin.