This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Allens-
o Populations with more mass in colder regions, less mass in warmer regions
o Shorter and stockier limbs for colder regions, longer limbs for warmer areas
o Heritability of Height (polygenic)
▪ difference attributed to genetics, rest environmental
o Identifying 10 million SNPs (single nucleotide polymorphisms)
o Predict phenotype from genotype
Hair Variation (D. Hardy 1973)
Genes that are responsible for genetic disorders can also underlie normal variation.
o Ectodermal Dysplasia (can’t sweat) connected to the fine hair allele, abnormal
development of teeth, hair
Conclusions: epigamic phenotypes are influenced by one, several, or many genes.
o Mutations can result in variations we consider normal or extreme variation
CLASS 15 OBESITY
o Measuring Body Fat
▪ Hydrodensitometry (water displacement), Calipers (skinfold), DEXA (dual energy
o BMI (Body mass index)= weight/ height x height- oversimplification
o Health Risks of Obesity- Heart disease, stroke, blood pressure…
▪ Diabetes- too much glucose in blood stream
▪ Insulin is a hormone that moves glucose from blood to cells
▪ Type 1- no insulin production, type 2-
not enough insulin
o Obesity and Fertility
▪ Women BMI 30-
45% less likely to conceive
▪ 3x as long both partners obese, 1.5x as long partners over weight
o Types of Gen...
View Full Document
- Spring '08
- The American