5 Written questions
5 Matching questions
- Nonsense mutation
- Homeobox genes
- Genetic code
- a Characteristic in which the allele responsible is expressed in the phenotype even in those with heterozygous genotypes.
- b Genes that control the development of the body plan of an organism.
- c Alleles present within cells of an individual, for a particular trait/characteristic.
- d A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
- e The way in which the 64 possible base triplets map onto the 20 amino acids that are used in polypeptide chains.
5 Multiple choice questions
- The DNA strand that is used for assembly of mRNA by RNA polymerase using base-pairing rules. Complementary to the message sequence.
- Eukaryotic cell or organism that has two different alleles for a specific gene.
- One of three triplet codes (UGA, UAG or UAA) that causes the termination of translation by the ribosome.
- Specific position on a chromosome, occupied by a specific gene.
- Failure of members of a homologous pair of chromosomes, or of a pair of chromatids, to separate during nuclear division.
5 True/False questions
Allele → A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
Spindle fibres → Structure formed on the centromere that attaches the chromosomes to the spindle fibres during mitosis and meiosis.
Degenerate → A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
Gametes → Specialised sex cells. In many organisms the gametes are haploid and are produced by meiosis.
Phenotype → Observable characteristics of an organism.