BIOL 202 Study Guide - Gill Raker, Fish Measurement, Satellite Dna

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taupehare180

22 Aug 2012

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Polygenic: traits influenced by multiple genes. Leads to continuous variation in the trait. Examples: heights of cadets, swimming speed of men/women, general cognitive ability (sats, iq tests ) Increase # loci = more continuous variation. Environment causes phenotype to vary with genotype (even with one locus) Total phenotypic variance = genetic (aid) + environmental(me) Dominance variance: variance due to dominance effects between alleles, hybrid = dominant phenotype. Epistatic variance: due to interactions between different loci, possible deviation from additive & dominance, example: soap berry bug. Derived: golden rain tree, smaller beak. Ancestral: balloon vine fruit. Beak type = additive, dominance & epistasis. Preference to host site = additive. Maternal: variance due to phenotype of mom, important in natural population, types. Plastic: example: mosquito fish weights. Stickleback: additive genetic effects, dominance genetic effects. Backcross shows: gill rakers = additive & body depth = dominance) Body depth: length gill rakers. Proportion of phenotypic variance that has a genetic bases: narrow sense.

Related Questions

(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

turquoisehorse176

22. Which of the following statements about polygenic traits and Mendelian traits are CORRECT? i. Polygenic traits are rarely involved in adaptation. ii. Mendelian traits commonly show discontinuous variation. iii. Polygenic traits are more strongly influenced by the environment. iv. Mendelian traits are usually governed by a small number of genes. a. i, iv b. ii, iii, iv c. i, ii, iii d. ii, iv

. 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

BIOL 202 Study Guide - Gill Raker, Fish Measurement, Satellite Dna

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