inheritance

• Phenotypic plasticity


  Develop traits suited to the environment experienced by an organism by varying patterns of gene expression
• PKU


  • Autosomal recessive disease where the enzyme PAH hydrolase is non-functioning
  • Enzyme converts phenylalanine to tyrosine, it builds up in the brain without the enzyme
• PKU


  • Intellectual disability
  • Delayed development
  • Social problems
• Gene pool


  All the alleles and genes present within an interbreeding species
• Y chromosome


  Contains the SRY gene that develops gonads into testes and male typical characteristics
• Sex linked disorders


  • Hemophilia
  • Caused by a mutation on the gene for clotting factor VIII
• Autosomal gene linkage


  • Loci of linked genes are close together on the same chromosome
  • Likely to be inherited together
  • Independent assortment does not occur
  • Linked genes are segregated together on the same chromosome during anaphase I
  • Recombinant gametes are produced due to crossing over
• codominance: heterozygotes have a dual phenotype, blood group
• incomplete dominance: heterozygotes have an intermediate phenotype, marvel of peru flower