Small-beaked birds fed Large-beaked birds could crack hard seeds. efficiently on soft seeds. Blue bars indicate the young birds that died. 60 No birds with beaks of intermediate size survived because 50 they fed inefficiently on both hard and 40 soft seeds. 30 20 10 10 12 14 16 18 Width of lower beak (mm) Some small- and large-beaked young birds (red bars) survived the dry season. Number of birds
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
Of the three patterns of natural selection presented in this discussion, which one always results in two different
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