Summary
The passing of traits from parents to offspring through genetic material.
In depth
Offspring resemble parents because genetic information in DNA is copied and passed on in gametes. Resemblance is not perfect: recombination, mutation and the environment create differences. Before DNA was understood, people believed in blending inheritance, which Mendel's work showed to be wrong, because traits stay distinct and reappear in later generations.
Genetics today covers classical transmission patterns, the molecular nature of genes and the behaviour of genes in populations.
Before Mendel, people believed in blending inheritance, in which offspring were a smooth mix of the parents. Particulate inheritance, in which discrete units pass intact, explains why traits can vanish and reappear in later generations. Heredity works at several levels: DNA sequence, chromosomes in cells, and traits in families and populations.
Not everything inherited is genetic sequence: epigenetic marks, mitochondria, gut microbes and learned culture can also pass between generations, although DNA is the main carrier. Modern genetics tests heredity with twin and adoption studies, pedigrees and genome sequencing.
Example: identical twins share nearly all their DNA, so differences between them reveal the effect of environment and chance.
Frequently asked questions
What is Heredity?
The passing of traits from parents to offspring through genetic material.
Which area of biology covers Heredity, and how advanced is it?
Heredity is one of the 54 topics in Genetics. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Pedigree Analysis, Mendel's Pea Experiments, Epigenetics.
Can you give an example of Heredity?
A child may have blue eyes though both parents have brown, because a recessive allele was hidden in each parent.
What should I learn before Heredity?
Heredity is a Beginner topic, so no earlier topic is required. Other Beginner topics in Genetics that pair well with it include Gene, Allele, Genotype and Phenotype.
What topics are related to Heredity?
The closest topics to Heredity are Pedigree Analysis, Mendel's Pea Experiments, Epigenetics, Homozygous and Heterozygous. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Heredity?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Heredity. To practise the whole of Genetics, use the Genetics quiz.
How is Heredity different from Pedigree Analysis?
Heredity: The passing of traits from parents to offspring through genetic material. Pedigree Analysis: Family trees that trace a trait across generations to infer dominant, recessive or sex-linked inheritance. Read both side by side and note what each one explains.
How should I study Heredity step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Pedigree Analysis and explain the difference aloud. Finally, take the Genetics quiz and come back to this page for any question you miss.