GENETICS AND INHERITANCE — Grade 12 Life Sciences Notes

Comprehensive CAPS-aligned study notes for GENETICS AND INHERITANCE in Grade 12 Life Sciences. Browse the sections below to find detailed explanations, worked examples, and exam preparation material.

Sections in GENETICS AND INHERITANCE

Introduction to Genetics and Inheritance

Genetics and Inheritance Every living organism carries a set of instructions encoded in its DNA that determines its characteristics. Genetics is the branch of biology that studies how these…

Key Concepts in Inheritance

Concepts in Inheritance To solve any genetics problem, you first need to master the key terminology that forms the foundation of inheritance. These terms appear in every genetics question, from…

Monohybrid Crosses

Monohybrid Crosses A monohybrid cross investigates the inheritance of one characteristic at a time. This is the most fundamental type of genetic cross and forms the basis for understanding all other…

Sex Determination

Sex Determination In humans, the sex of an individual is determined by the sex chromosomes (also called gonosomes) present at chromosome pair 23. The remaining 22 pairs of chromosomes are called…

Frequently Asked Questions

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The GENETICS AND INHERITANCE section covers all key concepts from the Grade 12 Life Sciences CAPS curriculum, including detailed explanations, worked examples, and exam preparation tips.

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Sex-Linked Inheritance

Sex-Linked Inheritance Sex-linked inheritance refers to the inheritance of genes located on the sex chromosomes, specifically the X chromosome. Because the Y chromosome is much smaller and carries…

Blood Grouping (ABO System)

Blood Grouping (ABO Blood Group System) Blood grouping is an example of co-dominance and multiple alleles. The ABO blood group system is controlled by a single gene on chromosome 9, but there are…

Dihybrid Crosses

Dihybrid Crosses A dihybrid cross involves the inheritance of two different characteristics (two genes located on different chromosomes) at the same time. While monohybrid crosses use a 2×2 Punnett…

Genetic Lineages and Pedigree Diagrams

Genetic Lineages and Pedigree Diagrams A pedigree diagram is a chart that shows the inheritance of a genetic trait through several generations of a family. Pedigree diagrams are used by genetic…

Mutations

Mutations A mutation is a sudden, permanent change in the DNA or chromosome structure. Mutations can occur naturally (spontaneous mutations) or be caused by environmental factors called mutagens…

Genetic Engineering and Biotechnology

Genetic Engineering and Biotechnology Genetic engineering is one of the most rapidly advancing fields in biology. It involves the deliberate modification of an organism's DNA to produce desired…

Paternity Testing and DNA Profiling

Paternity Testing and DNA Profiling Determining parentage (paternity) is one of the most practical applications of genetics. Two methods are used in the CAPS curriculum: blood group analysis (based…

Linking Genetics Topics — Exam Revision Guide

Linking Genetics Topics — Exam Revision Guide Genetics and inheritance is one of the highest-weighted topics in the Grade 12 Life Sciences exam. Questions often combine multiple genetics concepts in…