Environmental effects have no impact on true-breeding, homozygous strains (inbred lines) of plants or animals.

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Environmental effects can still impact the health and growth of true-breeding, homozygous strains of plants or animals, even if their genetic makeup remains consistent across generations. For example, if a particular strain of plant is susceptible to a certain disease that is prevalent in a particular environment, that strain may suffer decreased yields or even die out completely in that area. Additionally, environmental factors such as temperature, humidity, and sunlight can all affect the growth and development of even highly inbred plants or animals.

Environmental Effects Have No Impact on True-Breeding, Homozygous Strains (Inbred