Cell Division and Genetics

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Mitosis

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Cell division in which the nucleus divides into nuclei containing the same number of chromosomes.

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Chromosomes

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Threadlike structures made of DNA molecules that contain the genes.

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Genotype

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Genetic makeup of an organism.

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Phenotype

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An organism's physical appearance, or visible traits.

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Dominant allele

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An allele whose trait always shows up in the organism when the allele is present.

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Recessive allele

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An allele that is masked when a dominant allele is present.

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Homozygous

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An organism that has two identical alleles for a trait.

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Heterozygous

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An organism that has two different alleles for a trait.

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Homozygous alleles

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Illustration of homozygous alleles.

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Heterozygous alleles

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Illustration of heterozygous alleles.