Alleles - different versions of the same gene, Asexual reproduction  - reproduction which requires only one parent; results in clones, Cancer - a disease which occurs as the result of cell changes that lead to uncontrolled growth and division, Clone  - an organism which is genetically identical to its parent, Continuous variation  - variation which can take any value between a minimum and a maximum, Diploid cells  - cells which contain two sets of chromosomes, Discontinuous variation  - characteristic which falls into distinct groups, Dominant allele  - version of a gene whose characteristics is always expressed if present in the genotype, Environmental variation  - variation caused by the environment, fertilisation - joining together of two gametes, gametes - sex cells, genetic cross - technique used to show the possible characteristics of an offspring, genetic variation - variation caused by an organism’s genetic material, genome - all the genetic material present in an organism, genotype - the combination of alleles present in an organism, haploid cells - cells which contain one set of chromosomes, heterozygous - organism who has different alleles of a gene, homozygous - organism who has two copies of the same allele, meiosis - cell division which produces gametes, mutation - change in the sequence of DNA bases, phenotype - characteristics which are observed in an organism, Punnett square - diagram used to show the possible genetic makeup of offspring, based on a mother’s and a father’s genes, recessive allele - version of a gene whose characteristic is only expressed if two copies are present in the genotype, sexual reproduction - reproduction requiring two parents, which results in variation, variation - differences within a species, zygote - fertilised egg,

B5.1 Inheritance

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