Fig. 8.1 is a diagram of a cross-section of a human eye. Fig. 8.2 shows part of a family tree in which some of the individuals have the type of glaucoma caused by the recessive allele, g. In Fig. 8.2, shaded boxes show individuals who have glaucoma, while unshaded boxes show individuals with normal vision.
(a(i))[2]
On Fig. 8.1, label and name the eye part that focuses light to produce a clear image.
(a(ii))[2]
On Fig. 8.1, label and name the eye part at which the image is formed.
(b(i))[1]
What does the term inherited mean?
(b(ii))[2]
Explain the meanings of the terms: recessive; allele.
(c)[3]
Using G for the dominant allele and g for the recessive allele, complete the table to show the genotype of each family member numbered 1, 2, 3, 4 and 5.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A line that touches the lens and is labelled” …