5 Written questions
5 Matching questions
- Crossing over
- Initiator codon
- Programmed cell death
- a Characteristic in which the allele responsible is expressed in the phenotype even in those with heterozygous genotypes.
- b The triplet code recognised by the ribosome that signals the start point for translation. Almost invariably a methionine codon (ATG).
- c Where non-sister chromatids exchange alleles during prophase I of meiosis.
- d Having two sets of chromosomes (eukaryotic cell or organism). Denoted by 2n.
- e Alternative term for apoptosis.
5 Multiple choice questions
- A length of DNA that codes for one (or more) polypeptides/proteins. Some may code for RNA or regulate other genes.
- A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
- Refers to the location of cells with respect to the head end (anterior) or tail end (posterior) of the body.
- The points where non-sister chromatids within a bivalent join, where they cross over.
- A change to the DNA structure altering the sequence of bases.
5 True/False questions
Morphogen → 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.
Missense mutation → A change in DNA sequence that introduces a premature stop codon within a DNA coding sequence.
Genetic reassortment → Variation introduced due to the random orientation and subsequent segregation of maternal and paternal chromosomes during meiosis 1, or sister chromatids at meiosis 2.
Silent mutation → A change to the DNA structure altering the sequence of bases.
Insertion/deletion mutation → A change in DNA sequence involving the introduction or loss of 1- 1000s of bases.