• Gametes :  It is a macture sexcell which takes part in a sexual reproduction. It may be either male(sperm) or female( eggcell)
• Genes : It is the basic unit pf heridity.
• Allele : It is the different form of the same gene or an allele is one of the different form of the same gene which alter the way in which a particular character such as heigh is expressed.
• Zygote : A zygote is a single cell that is found as a result of a union a male sexcell and a female sexcell during reprodiction. It contains a diploiod number of chromosomes
• Homozygous : It is a situation were by there are two similar or identical allele for a given character eg. TT for tall
• Heterozygous : It is the situation wereby there are two disimilar or unidentical allele for a given character eg. Tt.
• Phenotype : It is the outward expression or appearance of an organism.
• Genotype : It is the genetics constitution or genetic makeup of an organism
• Allelomorphs : It is a pair of genes responsible for a pair of contrasting character like red and white flower colours.
• Chromosomes : Chromosomes are threadlike material or struction constitsting of nucleic acid and protons located within the nucleus of the cell.
• Recessive : This is an allele which can not express itself outward in a phenotype but can do so in a homozygous state eg allele for shortness « tt » is recessive for the allele of tall »Tt »
• Dominant : It refers to a stage in a gene that take autority during crosses
• Pure breed or pure line : These are parent that have the same characteristics and when cross the offspring have a similar characteristics or trade talll plant cross with another tall plant gives life to tall offsprings TT when criss to TT gives rise to tall offspring
• Hybrid : Hybrid are organism with a pair of different allele for a particular gene
• Filiar generation : It is a generation of offspring represented by F1 or F2
• Linkage : It is an existence of 2 or more allele of on the same chromosome.

Greger mendel is the father of genes. He carry out the process of using a garden pea plant.