Unit 1 Biology June 2011

Use the following diagram to answer Questions 1 to 3:

1. An allele is a





2. If John is heterozygous for galactosaemia, Jane’s genotype must be





3. Samir’s genotype must be





Use the following table about the codons on mRNA to answer questions 4 and 5:

4. Choose the sequence of amino acids found in the polypeptide chain that is coded for by this part of the mRNA molecule.





5. Choose the final codon on this mRNA molecule if GUU is the last codon for an amino acid.