BIOLOGY 152 Lecture : Evolution Chapter 7 Selection on Continuous Traits and Speciation (Bio 152)

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itschenzeqin

23 Jul 2022

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Chapter 7: selection on continuous traits and speciation. Question: this population of monkeyflowers has an average flower diameter of 3. 2 cm and a heritability of 0. 6. If the mean diameter of the flowers that set seed were 3. 7 cm, what will be the flower mean diameter in the next generation? r= (0. 6)*(3. 7-3. 2) r= 0. 3 cm. 0. 3cm + 3. 2cm = 3. 5 cm = flower mean diameter of the next generation r= h2s. Continuous traits: a trait that is characterized by values on a continuous scale, rather than being controlled by a single locus. Heritability (h2): the fraction of the variation in a population that can be explained by genetics. Response to selection (r): the amount the mean trait value in a population changes after one generation. Variance: a measure of the spread of the distribution of a trait value in a population (mathematically, the sum of the squared standard deviations from the mean value)

Related Questions

Many traits are affected by theenvironment, but also have a genetic component. How can wepartition the sources of variation? Write a formula for this. Ifyou want to measure the sources of variation, how can this be doneexperimentally? Write out howyou can do this making specific reference to yourformula.

Heritability can be defined in two ways.What are these definitions and how are they different?

Not all genetic variation is the same. Whatis the difference between additive, dominance, and epistatic formsof genetic variation? Define all three, and update your formula. Inaddition, use a regression plot to schematize additive anddominance variation (ie, box 9.2).

Differential survival and reproduction canbe measured empirically, as can quantitative phenotypes of nearlyany organism. From these we can calculate selection differentialsand selection gradients. What are selection differentials andgradients?

Selection can act on quantitative traits ina variety of ways. Draw a diagram of what directional, stabilizing,and disruptive selection would look like on the distribution of atrait, then describe and explain the differences. Write concisedefinitions next to each type of selection.

If two populations differ in a trait thathas a high heritability, is it valid to conclude that the twopopulations differ genetically with respect to that trait? Useevidence from section 9.7 to explain why or why not.

greenminnow746

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During our classroom discussion on evolution, we emphasized three requirements for natural selection: variation for a trait in a population, heritability of a trait, and differential reproductive success.

It is suggested that humans are evolving with respect to two traits that likely are favored by natural selection: HIV resistance and Height

Although human height is influence by both genetic and environmental factors â Human height is clearly variable. Human height has increased substantially over the past three decades. In certain populations, those changes seem to be due to evolution rather than improved nutrition and medical care.

Addressing the requirements for natural selection â Are humans evolving with respect to height?

NOTE: You may use any creditable resource to address this question

is leprosy a continuous or discontinuous trait, please explain why?

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BIOLOGY 152 Lecture : Evolution Chapter 7 Selection on Continuous Traits and Speciation (Bio 152)

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