5 Written questions
5 Matching questions
- Neutral mutation
- Silent mutation
- a A mutation that even though it may change a coding sequence exerts no harmful or beneficial effects.
- b 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.
- c A change in DNA sequence within a gene that does not lead to a change in the amino acid sequence due to the degeneracy of the genetic code.
- d Molecule (nucleotide derivative) found in all living cells and involved in energy transfer. When it is hydrolysed energy is released.
- e Alleles present within cells of an individual, for a particular trait/characteristic.
5 Multiple choice questions
- Eukaryotic cell or organism that has two identical alleles for a specific gene.
- 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.
- Specific position on a chromosome, occupied by a specific gene.
- Characteristic coded for by one gene.
- The fundamental relationship between DNA, RNA and protein first outlined by Francis Crick in 1958.
5 True/False questions
Protein → A stretch of DNA consisting of two or more genes that are transcribed together and coregulated.
Sexual reproduction → Causes an expansion or contraction of a run of identical codons within a gene affecting the length of a run of identical amino acids in the polypeptide.
Proto-oncogene → Gene that can undergo mutations to become an oncogene, which induces tumour formation (cancer).
Crossing over → Where non-sister chromatids exchange alleles during prophase I of meiosis.
Recessive → 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.