BIOL 202 Lecture Notes - Lecture 9: Quantitative Genetics, Probability Distribution, Zygosity
9 Feb 2018
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Midterm exam is moved from 7:00-8:30 pm on february 22nd. Muddiest points poll will be open longer (until 10:45 am) We have visited the mendellian core of genetics, it"s time to scale genetics to populations. Important for understanding disease, crop improvement, evolutionary change : ex: people may be predisposed towards heart disease. Quantitative genetics (like during the seed colour example a few lectures back) usually follows a normal distribution (bell-curve) Different types of quantitative trains: continuously varying. Grade into one another: meristic traits: X-axis of distribution is continuous (ex: height, where people can be, for example,1. 2 m to 2. 3 m and an infinite amount of decimal numbers in between) X-axis is made of discrete (whole) numbers (ex: abdominal bristles of a fruit fly: you have 1, 2, 3, 4, 5, 6, 7 not 4. 5: threshold traits: Either-or-phenotypes underpinned by tendency (ex: tendency to inherit heart disease, + environment, disease appears past a certain threshold)
