Polygenetic inheritance

• Polygenetic traits

  There are more than 2 gene Loci that influence the trait
• examples of Polygenetic traits

  height

  skin colour
• skin colour

  influenced by the pigment melanin

  melanin increases protection from UV rays but vitamin D production needs high light intensities

  human migration led to the evolution of melanin production
• what type of variation does polygenetic inheritance contribute to?

  continuous variation
• what are the two types of variation

  discontinuous= a small number of phenotypes possible, monogenetic or diogenetic

  continuous= a large array of phenotypes possible, Polygenetic
• how many base pairs are therein a human genome

  approx 3 billion
• how many pairs of genes on the human genome

  21,000
• how many proteins are their on the human proteome

  90,000 approx