Biol 117

• Two categories:
• Qualitative
• Quantitative

A genetic disease that is either present or absent.

Measurable physiological or biochemical quantities such as height, blood pressure, body mass index...

• h²
• to quantify the role of genetic differences in determining variability of quantitative taits.

= Variance in DZ pairs - Variance in MZ pairs / Variance in DZ pairs.

MZ twins- share 100% genes; DZ - share 50 %