Gene, The basic unit of heredity., Chromosome, Thread-like structures made of DNA found in the nucleus., Allele, Different versions of a gene., Phenotype, The physical appearance of an organism., Genotype, The genetic makeup of an organism., Dominant, A trait that masks the expression of another trait., Recessive, A trait that is expressed only when two copies are present., Homozygous, Organisms that have two identical alleles for a trait., Heterozygous, Organisms that have two different alleles for a trait., Meiosis, The process by which gametes are formed with half the number of chromosomes..

GENETICS

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