5 Written questions
5 Matching questions
- Stop codon
- Frameshift mutation
- a Specific position on a chromosome, occupied by a specific gene.
- b Term to describe the engulfing by macrophages of vesicles from cells that have undergone apoptosis.
- c One of three triplet codes (UGA, UAG or UAA) that causes the termination of translation by the ribosome.
- d The points where non-sister chromatids within a bivalent join, where they cross over.
- e A change in the DNA within a gene involving the insertion or deletion of a number of bases that is not a multiple of three. This causes the downstream gene sequence to be scrambled because the correct reading frame is lost.
5 Multiple choice questions
- Programmed cell death. An orderly process by which cells self-destruct in an orderly fashion after a certain number of cell divisions, or if they cannot repair DNA damage.
- Groups of homeobox genes. More complex organisms have more such groups, probably due to a mutation that duplicated them.
- Eukaryotic cell or organism that has two different alleles for a specific gene.
- Specialised sex cells. In many organisms the gametes are haploid and are produced by meiosis.
- Genetic variation where there are distinct phenotypic categories. Usually controlled by one gene to a few genes. Examples include cystic fibrosis, shape of earlobes in humans and height in pea plants.
5 True/False questions
Mutation → A stretch of DNA consisting of two or more genes that are transcribed together and coregulated.
Paternal chromosome → Member of a pair of homologous chromosomes that originally came from the male gamete.
Polypeptide → Large polymer molecule made of many amino acids joined by peptide bonds.
Homeotic selector genes → Genes that control the development of the body plan of an organism.
DNA mutation → A change to the DNA structure altering the sequence of bases.