Key Concepts:
* Genes: Units of heredity that determine specific traits.
* Alleles: Alternative forms of a gene located at the same position (locus) on a chromosome.
* Homozygous: Having two identical alleles for a trait.
* Heterozygous: Having two different alleles for a trait.
Example:
Let's consider the gene for eye color. The alleles for eye color are:
* B: Brown eyes (dominant)
* b: Blue eyes (recessive)
An individual with the genotype BB would have brown eyes (homozygous dominant).
An individual with the genotype Bb would also have brown eyes (heterozygous).
An individual with the genotype bb would have blue eyes (homozygous recessive).
Significance of Genotype:
* Predicting Traits: Genotype plays a crucial role in determining an organism's traits.
* Inheritance Patterns: Genotype is passed from parents to offspring, explaining inheritance patterns.
* Genetic Variation: Differences in genotype contribute to the diversity of individuals within a population.
* Genetic Disorders: Certain genotypes can predispose individuals to genetic disorders.
In summary, genotype is the genetic blueprint of an organism, determining its inherited characteristics. It plays a fundamental role in heredity, trait expression, and genetic diversity.
