Watch this video (http://openstaxcollege.org/l/ DanielleReed) to learn about Dr. Danielle Reed of the Monell Chemical Senses Center in Philadelphia, PA, who became interested in science at an early age because of her sensory experiences. She recognized that her sense of taste was unique compared with other people she knew. Now, she studies the genetic differences between people and their sensitivities to taste stimuli. In the video, there is a brief image of a person sticking out their tongue, which has been covered with a colored dye. This is how Dr. Reed is able to visualize and count papillae on the surface of the tongue. People fall into two large groups known as tasters and non-tasters on the basis of the density of papillae on their tongue, which also indicates the number of taste buds. Non-tasters can taste food, but they are not as sensitive to certain tastes, such as bitterness. Dr. Reed discovered that she is a non-taster, which explains why she perceived bitterness differently than other people she knew. Are you very sensitive to tastes? Can you see any similarities among the members of your family?
Evolutionary Bio Test 3 Week 1 This set of notes includes everything Dr. Sears covered in class plus all of the vocabulary and major notes from the textbook from this week. 3/3 Posttest talk Textbook Vocab Ch. 9 Quantitative genetics branch of evolutionary biology that provides tools for analyzing the evolution of multilocus traits Qualitative traits traits that allows characters to be qualified by looking at them Quantitative traits characters with continuously distributed phenotypes Quantitative trait loci (QTLs) portions of the genome that influence quantitative traits QTL mapping the collective name for a suite of related techniques that employ marker loci to scan chromosomes and identify regions containing genes that contribute to a contribute to a quantitative trait Heritability the fraction of the total variation in a trait that is due to variation in genes Phenotype variation (V )Ptotal variation in a trait Genetic variation (V )G variation among individuals due to variation in their genes Environmental variation (V )Eariation among individuals due to variation in their environments Heritability equation (BroadSense heritability) V /V =(V /V +V ) G P G G E Midparent value the average of the parents Midoffspring average of the offspring (if more than 1) Narrowsense heritability the ratio of additive genetic variance to the total phenotypic variance Directional selection when fitness consist
