Explore free A-level Biology revision articles about inheritance, including monohybrid and dihybrid crosses, codominance, multiple alleles, autosomal and sex linkage, and epistasis. These explanations can support students studying AQA, OCR A or Edexcel Salters–Nuffield Biology, although the precise content required varies between exam boards.
Inheritance revision articles
- Monohybrid Inheritance – Inheritance Ep 1
A diploid organism (e.g. a human) has two alleles of each gene in their chromosomes. Alleles are alternative forms of a gene, so an organism… Continue Reading → - Codominance and Multiple Alleles – Inheritance Ep 2
In the last article we looked at inheritance of a characteristic coded for by a single gene which has one dominant allele and one recessive… Continue Reading → - Dihybrid Inheritance – Inheritance Ep 3
Dihybrid inheritance looks at the possibilities of two characteristics being inherited together. Each characteristic is coded for by a separate gene. Punnett squares can be… Continue Reading → - Autosomal Linkage and Sex Linkage – Inheritance Ep 4
Autosomal linkage and sex linkage are two cases where inheritance is very dependent on which chromosome the genes are found on. This is definitely the… Continue Reading → - Epistasis – Inheritance Ep 5
Epistasis is when the expression of an allele of one gene masks the expression of the alleles of another. Let’s use flower colour as an… Continue Reading →
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