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BIOC14H3 Lecture 8: BIOC14 : Lecture 8 : Inheritance of Complex Traits

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School
UTSC
Department
Biological Sciences
Course
BIOC14H3
Professor
Patrick Mc Gowan

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Document Summary

Bioc14 : lec 8 : inheritance of complex traits. Genotype effects (nature) + environmental effects (nurture) which is more important and how to estimate the relative contributions of genes & environmental factors. Contribution of gene or environment depends on the trait that we"re interested in. Qualitative traits that are influenced by single genes, environmental contribution is quite low (if you have the gene, you tend to get the trait/disorder) Quantitative traits (usu. polygenic) that vary along a continuous dimension, you have much larger enviro contribution (depending on trait/disorder, the effects are greater/less) To determine what portion of variation is due to genes/enviro = use statistics = quantitative genetics. Heritability: gene-enviro contribution rather than something will be passed on from generation to generation. To understand how much variation in a population is due to genetic variation, have to understand concept of variance.

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Related Questions

  1. (a) Discuss ways in which phenotypic variation occurs withinpopulations. (b) Explain how phenotypic variation aids in thesurvival of the fit.

Write your response below.

a) phenotypes can be caused by

  • genetic variation

  • environmental factors

  • Both.

Genetic variation cause phenotypic change. when two geneticallydifferent parents mate then there are chances to get phenotypicvariations. Like a mule is crossbreed between a horse and a donkey.while environmental factors are things in an organism'ssurroundings that can influence it in various ways. For example,body weight in humans may be influenced by genes but is alsoinfluenced by diet. In this case, diet is an example of anenvironmental factor.

I NEED B ANSWERED!!!

Is A correct? I might be wrong I'm terrible at thisclass please help

. Identical twins share the same genotype, meaning their geneticmakeup is the same. Researchers have discovered, however, that thephenotype (or the observable expression of a gene) of identicaltwins grows apart as they age. Our genes influence how we respondto our environment, and at the same time the expression of ourgenes are changed by the environment around us; therefore therelationship between genetic and environmental influences cannot beeasily separated In sum, it is easier to find sociological,cultural, or environmental explanations for variation in humanabilities, intelligence, or personality traits. The seeminginheritance by family of some of these traits may well be acombination of something genetic and something experiential orcultural, but when looking for the actual underlying causes,genetics has repeatedly come up wanting while environmentalexplanations do a good job of addressing a fairly large part of thevariation we see.

rewrite the text to look like if it's your own writing tryto change as much world as you can :)thanks in advance

Predict a childĆ¢Ā€Ā™s IQ. FatherĆ¢Ā€Ā™s IQ = 110, motherĆ¢Ā€Ā™s IQ = 120, population mean = 100, estimated value for h2 = 0.4. Explain how genetic variation and environmental variation can contribute to IQ ?