| Date | May 2010 | Marks available | 1 | Reference code | 10M.2.SL.TZ2.3 |
| Level | Standard level | Paper | Paper 2 | Time zone | Time zone 2 |
| Command term | Define | Question number | 3 | Adapted from | N/A |
Question
Define the term allele as used in genetics.
[1]
a.
List the possible genotypes for blood group B.
[1]
b.
Markscheme
allele: one specific form of a gene (occupying the same gene locus as other alleles of the same gene)
a.
IBIB and IBi
b.
Examiners report
Most candidates could recall a definition of an allele.
a.
Many candidates did not use appropriate notation and did not score a mark. The Biology subject guide is very clear that candidates must use the IA, IB, i notation for the relevant alleles
b.
