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Human GeneticsMonica Starbinski
Greer Manton
Sydney Gilbert
Period 2
Pedigrees
Monica Starbinski
Key – -Male(affected)
- Male (normal)
-Female (affected)
- Female (normal)
- Heterozygous for recessive allele
Generation 1
Generation 2
Generation 3
Autosomal Recessive Disorders
Tay-Sachs Disease
Cystic Fibrosis
Albinism
The disorder is present.
Phenotype ratio –1 has disease : 3 do notPercentage – 25% have disease, 75% dont
Genotype ratio –1 AA : 2 Aa : 1 aaPercentage – 25% AA, 50% Aa ,
25% aa
Autosomal Dominant Disorders / Traits
Huntington’s Disease
Widow’s Peak Hairline
Free/Hanging Earlobes
Phenotype ratio –3 have disease : 1 does notPercentage – 75% have disease, 25% dont
Genotype ratio –1 GG : 2 Gg : 1 ggPercentage – 25% GG, 50% Gg,
25% gg
The disorder is present.
Current Event on Human Genetics
http://www.sciencenews.org/view/generic/id/59938/title/Tracing_Jewish_roots
Greer Manton
CodominanceGenotype Ratio:1 A1A1 : 2 A1A2 : 1
A2A2Percentage:25% A1A1, 50% A1A2,
25% A2A2
Phenotype Ratio:1 Purple : 2 Red : 1
YellowPercentage:25% Purple, 50% Red,
25% Yellow
Homozygous
Heterozygous
Roan Cattle
RR’ Flower
R’ R
R
R’
RR’
RR
R’R’ RR’
Greer Manton
Multiple AllelesGenotype Ratio:1 TTWW : 3 TTWw, 2
TtWW : 4 TtWw, 2 Ttww : 1 ttWW, 2 ttWw : 1 ttww
Percentage: 6.25% TTWW, 18.75%
TTWw, 12.5% TtWW, 25% TtWw, 12.5% Ttww, 6.25% ttWW, 12.5% ttWw, 6.25% ttww
TtWw x TTWw
Dihybrid
Haemolytic Anaemia
Greer Manton