Soil pH influences flower color indirectly by influencing the availability of aluminum in the soil. Aluminum is more accessible to the roots in acidic soil (pH 5.5 or lower), resulting in blue flowers. Because the bulk of Georgia soils are acidic, most hydrangea flowers are blue.
A mutation or alteration in one of the genes that provides instructions for generating the clotting factor proteins required to create a blood clot causes hemophilia. This alteration or mutation can cause the clotting protein to malfunction or go absent entirely. Hemophilia is a recessive X-linked trait.
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