Biology Mock 2026

Monohybrid Inheritance

The inheritance of one trait - determined by one gene and its alleles

Complete Dominance

When a dominant allele completely masks the expression of a recessive allele

Incomplete Dominance

No allele is completely dominant over the other - Neither allele is fully expressed in the heterozygote

Co-Dominance

Both alleles are equally dominant - both alleles are independently expressed in the heterozygote

Lethal Allele

Gene mutations that disrupt the function of an essential gene

Dihybrid Inheritance

The inheritance of two traits - determined by two genes and its alleles

Allele Frequency

Number of a particular allele in a gene pool

Gene flow

The immigration of genes from a gene pool

Genetic Diversity

Variations in the genetics of a population

Genetic drift

Frequency of alleles in a population changes over time due to random chance rather than natural selection

Founder effect

New population loses genetic diversity because it was started by a very small group of individuals

Bottleneck Effect

A sharp, random reduction in a population’s size and genetic diversity caused by natural disasters or human activities

Natural Selection

Organisms with best traits best suited to their environment are more likely to survive and reproduce