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BIOL 1070 Lecture Notes - Heredity, Genotype, Natural Selection

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blueelephant164
26 Nov 2011
School
University of Guelph
Department
Biology
Course
BIOL 1070
Professor
Wright& Newmaster

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Document Summary

Females had much larger sample size, a & c are the largest numbers on both male and female. Exam question answer: b) there has been a great deal of movement of mussels into this river from nearby lakes. What is a gene: a molecular unit of heredity in a living organism. It s made up of stretches of dna and rna that may code for a type of protein or have a function in the organism. : is a form of a gene group of genes. Different alleles may result in different traits, such as eye or flower petal color. Different alleles may gibe rise to the same trait resulting in genetic variation in alleles with little or o variation in traits. The primary source are errors in dna replication. Mutations do not occur in order to benefit the organism. Founder effects: loss of genetic variation that occurs when a new, smaller populations is established.

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Related Questions

6. Which evolutionary effect would be most likely to occur if asmall part of a population relocated to a new area?

  • artificial selection
  • the bottleneck effect
  • the founder effect
  • genetic drift

7. Which process will decrease the magnitude of phenotypicvariation between generations?

  • disruptive selection
  • stabilizing selection
  • directional selection
  • None; they all increase phenotypic variation.

DNA mutations lead to genomic and phenotypic variation. Describe processes by which they are generated. Describe intracellular genetic mechanisms which could lead to the beneficial mutations in one organism finding their way into other organisms.

  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