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5 Written questions

5 Matching questions

  1. Genotype
  2. Nonsense mutation
  3. Homeobox genes
  4. Genetic code
  5. Dominant
  1. a Characteristic in which the allele responsible is expressed in the phenotype even in those with heterozygous genotypes.
  2. b Genes that control the development of the body plan of an organism.
  3. c Alleles present within cells of an individual, for a particular trait/characteristic.
  4. d A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
  5. 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

  1. The DNA strand that is used for assembly of mRNA by RNA polymerase using base-pairing rules. Complementary to the message sequence.
  2. Eukaryotic cell or organism that has two different alleles for a specific gene.
  3. One of three triplet codes (UGA, UAG or UAA) that causes the termination of translation by the ribosome.
  4. Specific position on a chromosome, occupied by a specific gene.
  5. Failure of members of a homologous pair of chromosomes, or of a pair of chromatids, to separate during nuclear division.

5 True/False questions

  1. AlleleA length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.

          

  2. Spindle fibresStructure formed on the centromere that attaches the chromosomes to the spindle fibres during mitosis and meiosis.

          

  3. DegenerateA length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.

          

  4. GametesSpecialised sex cells. In many organisms the gametes are haploid and are produced by meiosis.

          

  5. PhenotypeObservable characteristics of an organism.