Here's a breakdown:
* Allele: A variant form of a gene. For example, the gene for eye color might have an allele for brown eyes and an allele for blue eyes.
* Homozygous: Having two identical alleles for a particular trait.
* Heterozygous: Having two different alleles for a particular trait.
Example:
* If an organism has two alleles for brown eyes (BB), it is homozygous for eye color.
* If an organism has one allele for brown eyes (B) and one allele for blue eyes (b), it is heterozygous for eye color.
