Skin color is determined by three sets of genes on chromosomes #'s 1, 2,and4. The dominant genetic code, gene "A" translates into a protein called melanin. This dark pigment is like a natural UV blocker. The greater the number of dominant genes one has, the greater the amount of melanin, the darker the skin, and the more UV protection a person has. These genes have been selected-for near the Earth's equator where the intense UV photons can cause a great deal of damage to lighter skin.

Count up the number of dominant and recessive genes and place your baby's genotype for skin color in the data table.

 

 

 
Back to Front Page Back to Teacher's Information Page Back to Student's Instructions and Materials Back to Genotype -> Phenotype Classroom Booklet