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Published byMarsha Simmons Modified over 8 years ago
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Environmental Influence on Genes The external and internal Environment influences how a gene is expressed or if it is expressed
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External Environment Temperature, nutrition, light, chemical, and infectious agents can influence gene expression EX: Himalayan Rabbit
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Himalayan Rabbit Its genotype says that all the fur should be black The enzyme that produces the black pigment only functions at temperatures below 93°F. The nose, ears, tail, and feet, are in contact with cold enough temperatures to “activate” the enzyme
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If you were to put an ice pack on a Himalayan rabbit, the hair would grow in black The gene would be expressed, based on environmental conditions
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Internal Environment Internal environment of males and females are different because of hormones and structural differences The difference in hormones, and amount of hormone is determined by sets of genes
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EX: Male pattern baldness and feather colors in peacocks Male Female
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