tic condition where people are born without the usual pigment in their bodies due to the inability to create a normal amount of

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tic condition where people are born without the usual pigment in their bodies due to the inability to create a normal amount of melanin So most people with albinism have very pale skin hair and eyes In other words multiple traits are affected by a single gene Sometimes genes are not expressed because of interactions between the products of genes In a metabolic pathway all the enzymes required for the metabolic pathway must be expressed to create the final product A genotype that eliminates the expression of even one gene for an enzyme in the pathway affects all the others In sea turtles sex is determined not by chromosomes but instead by the temperature of the nest during development Research shows that if a turtle s eggs incubate below 27 7 degrees C the turtle hatchlings will be male If the eggs incubate above 31 degrees C however the hatchlings will be female Temperatures that fluctuate between the two extremes will produce a mix of male and female baby turtles incomplete dominance epistasis environmental factors

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