Pedigree Charts “showing” your family history

You gave me what….? Inheritance patterns of particular traits Inheritance patterns of particular traits –Examples: ___________________________ Figure A, B Ww ww Ww wwWw ww Ww WW or Ww ww First generation (grandparents) Second generation (parents plus aunts and uncles) Third generation (two sisters) Ff ffFf ff Ff ff Ff FF or Ff ff FF or Ff Widow’s peak No Widow’s peak Attached earlobe Free earlobe (a) Dominant trait (widow’s peak) (b) Recessive trait (attached earlobe)

Know your terms Figure 14.4 Allele for purple flowers Locus for flower-color gene Homologous pair of chromosomes Allele for white flowers

Wet vs. dry ear wax

Human conditions One example is achondroplasia One example is achondroplasia –A form of dwarfism that is lethal when homozygous for the dominant allele Figure 14.15

Pedigree charts track the history of a trait, characteristic, or disease within a family

From simple…to complex