5 Written questions
5 Matching questions
- Hox clusters
- Hayflick limit
- a Specialised sex cells. In many organisms the gametes are haploid and are produced by meiosis.
- b Groups of homeobox genes. More complex organisms have more such groups, probably due to a mutation that duplicated them.
- c Eukaryotic cell or organism that has two different alleles for a specific gene.
- d 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.
- e A reference to the fact that normal body cells can only divide a finite number of times, normally about 50 mitotic divisions. In contrast, tumour cells are essentially immortal.
5 Multiple choice questions
- The formation of an RNA molecule, using a length of DNA as a template and catalysed by RNA polymerase.
- A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
- Alleles present within cells of an individual, for a particular trait/characteristic.
- Genes that control the development of the body plan of an organism.
- Variation of genetic information in a gene pool.
5 True/False questions
Stop codon → One of three triplet codes (UGA, UAG or UAA) that causes the termination of translation by the ribosome.
Spindle fibres → Made of microtubules, these structures are responsible for providing the framework for segregation of the chromosomes during mitosis and meiosis.
Genome → A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
Template strand → The DNA strand encompassing a gene that carries the sequence identical to the message sequence.
Mutation → Structural change to genetic material - either to a gene or to a chromosome.