Sources of Variation
Mutations |
Meiosis |
Mendel's Laws of Inheritance
2. Principle of segregation
During reproduction, the inherited factors (now called alleles) that determine traits are separated into reproductive cells by a process called meiosis and randomly reunite during fertilisation. 3. Principle of independent assortment Genes located on different chromosomes will be inherited independently of each other. Exceptions to Mendel’s rules There are some exceptions to Mendel’s principles, which have been discovered as our knowledge of genes and inheritance has increased. The principle of independent assortment doesn’t apply if the genes are close together (or linked) on a chromosome. Also, alleles do not always interact in a standard dominant/recessive way, particularly if they are codominant or have differences in expressivity or penetrance. |
Monohybrid Inheritance
Complete Dominance
Incomplete Dominance |
Co-Dominance |
Multiple Alleles
|
|
Lethal Alleles
Dihybrid Inheritance
Gene Pools and Evolution
Natural Selection
Genetic Drift
Practice Exams
|
|
|
|
|
|