5 Written questions
5 Matching questions
- Sexual reproduction
- a A term applied to the genetic code that describes the fact that more than one triplet code is used to code for all amino acids other than tryptophan and methionine.
- b A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
- c Specialised sex cells. In many organisms the gametes are haploid and are produced by meiosis.
- d A stretch of DNA consisting of two or more genes that are transcribed together and coregulated.
- e Production of new organisms involving fusion of nuclei from male and female gametes, usually from unrelated individuals. Increases genetic variation in the population.
5 Multiple choice questions
- Gene that can undergo mutations to become an oncogene, which induces tumour formation (cancer).
- A characteristic where both alleles contribute to the phenotype.
- A substance that controls the pattern of tissue development. It is produced in a particular region of a developing organism. It diffuses to other cells, which then enter a specific developmental pathway.
- All the genetic information within an organism/cell.
- 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 True/False questions
DNA mutation → A change to the DNA structure altering the sequence of bases.
Polysome → A length of messenger RNA carrying multiple ribosomes at different stages of protein synthesis.
Meiosis → Type of nuclear division. A reduction division. The chromosome number is halved. It involves two divisions. It produces cells that are genetically different from each other and from the parent cell.
Bivalent → Pair of synapsed (joined) homologous chromosomes during prophase and metaphase of meiosis I.
Ribosomal RNA → Three types of RNA that form an important structural and functional role within the ribosome.