Transcript Pedigree Charts

Pedigree Charts
“showing” your family history
You gave me what….?

Inheritance patterns of particular traits
– Examples: ___________________________
Ww
ww
Ww ww ww Ww
WW
or
Ww
ww
Ww
Ww
ww
First generation
(grandparents)
Second generation
(parents plus aunts
and uncles)
FF or Ff
Ff
Ff
Third
generation
(two sisters)
ww
Widow’s peak
Ff
No Widow’s peak
Attached earlobe
ff
ff
Ff
Ff
Ff
ff
ff
FF
or
Ff
Free earlobe
Figure 14.14 A, B
(a) Dominant trait (widow’s peak)
(b) Recessive trait (attached earlobe)
ure 14.4
Know your terms
Allele for purple flowers
Locus for flower-color gene
Allele for white flowers
Homologous
pair of
chromosomes
Wet vs. dry ear wax
Human conditions

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