Terminologies in Genetic Inheritance

Alternative form of a gene.

• Allele

• Genotype

• Phenotype

• Gene

Genetic makeup of a gene. (Eg: Tt, TT, tt)

• Allele

• Genotype

• Phenotype

• Gene

Observable trait of a gene. (Eg: Tall, Short, Blue eyes, Black hair)

• Allele

• Genotype

• Phenotype

• Gene

Basic unit of heredity, control one trait or characteristic.

• Allele

• Gene

• Genotype

• Phenotyy

Long thread of DNA, contains many genes.

• Chromosome

• Nucleus

• Cell

• Protein

A genotype contains two dominant alleles. (Eg: BB, TT, HH)

• Homozygous dominant

• Homozygous recessive

• Heterozygous

• Homozygous

A genotype contains two recessive alleles. (Eg: bb, tt, hh)

• Homozygous dominant

• Homozygous recessive

• Heterozygous

• Homozygous

A genotype contains dominant and recessive alleles. (Eg: Bb, Tt, Hh)

• Homozygous dominant

• Homozygous recessive

• Heterozygous

• Homozygous

A genotype contains identical alleles. (Eg: bb, BB, tt, HH)

• Homozygous dominant

• Homozygous recessive

• Heterozygous

• Homozygous

This allele able to express the phenotype in homozygous and heterozygous condition.

• Dominant allele

• Recessive allele