Leaving Cert Notes

Notes and Anki Decks for the Leaving Cert

Genetics - Terms and Definitions

Term Definition
Species Organisms capable of interbreeding and producing fertile offspring
Heredity The passing on of traits from parent to offspring by means of genes
Gene Expression The process of using the information on the gene to make a protein
Gene A unit of DNA which codes for the production of a specific protein
DNA profiling Examining DNA / for a pattern or band / to compare OR A method of making a unique pattern of bands from the DNA of a person(, which can then be used to distinguish that persons DNA from other DNA)
Coding DNA That part of the chromosome which carries the information to make a protein
Non-coding DNA That part of the chromosome which doesn’t carry the information to make a protein
Genetic screening Testing (people) for the presence of a (specific) gene or to establish presence or absence of gene(s)
Transcription The process of producing mRNA using DNA as a template
Translation The process of making a protein using the mRNA code as a template
Gamete A haploid sex cell which is capable of fusion
Fertilisation The fusion of 2 (haploid) gametes to form a (diploid) zygote
Allele An alternative form of a gene
Homozygous Has identical alleles (for a trait)
Heterozygous Has different alleles (for a trait)
Genotype The genetic make-up of an individual
Phenotype Physical appearance of an organism
Dominance One allele masks the expression of the other
Recessive Allele whose expression is masked by dominant allele
Incomplete Dominance Neither allele masks the expression of the other
Variation Difference between members of species or population
Mutation Change in the genetic make up
Genetic Engineering Manipulation or alternation of genes
Evolution (Inheritable) change within a population (or species) / in response to change in the environment / by natural selection / overtime

Extended Study Genetics - Terms and Definitions

Term Definition
Mendel’s 1st Law (Segregation) Traits are controlled by pairs of alleles which separate at gamete formation. Each gamete carries only one allele for each trait
Mendel’s 2nd Law (Ind.Assortment) During gamete formation each member of a pair of alleles may combine randomly with either of another pair
Linkage Genes located on the same chromosome (are said to be linked)
Sex Linkage Gene located on X chromosome or on Y chromosome
Non-nuclear Inheritance DNA apart from that found in the nucleus (e.g. mitochondria) that is passed on to the next generation