{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Species and speciation lecture

Species and speciation lecture - Georgia Tech School of...

Info icon This preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology 1510 Georgia Tech School of Biology Fall 2008 Speciation What is a species? Species concepts We’ve grown apart: Reproductive Isolation Modes of speciation Patterns of Speciation
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Biology 1510 Georgia Tech School of Biology Fall 2008 Calculating Allele Frequencies p 2 = 0.30, 2pq = 0.50, q 2 = 0.20 N AA = 60, N Aa = 100, N aa = 40
Image of page 2
Biology 1510 Georgia Tech School of Biology Fall 2008 The frequency of two alleles in a gene pool is 0.1 (A) and 0.9 (a). Assuming Hardy-Weinberg equilibrium, what is the percentage in the population of heterozygous individuals and homozygous recessives? A) 18% heterozygous individuals, 81% homozygous individuals B) 25% heterozygous individuals, 74% homozygous individuals C) 33% heterozygous individuals, 66% homozygous individuals D) 44% heterozygous individuals, 55% homozygous individuals
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Biology 1510 Georgia Tech School of Biology Fall 2008 Assumptions The five conditions for nonevolving populations are rarely met in nature: No mutations Random mating No natural selection Extremely large population size No gene flow
Image of page 4
Biology 1510 Georgia Tech School of Biology Fall 2008 What is a species?
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Biology 1510 Georgia Tech School of Biology Fall 2008 What is a species? - a group of individuals that actually or potentially interbreed in nature Biological Species Concept (Mayer 1942) Problems …… - Many species reproduce asexually - Many species can produce hybrids - How to you determine whether or not species actually interbreed? - How do you classify the potential to interbreed?
Image of page 6
Biology 1510 Georgia Tech School of Biology Fall 2008 Dealing with hybrids Hooded crow Carion crow TWO SPECIES OR SUBSPECIES???
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Biology 1510 Georgia Tech School of Biology Fall 2008 The verdict is… In 2002 the Hooded and Carion crows were elevated to species status - hybrids were found to have reduced fitness compared to non-hybrids - hybrids were found to occur less frequently than expected in the population Hooded crow ( Corvus cornix ) Carion crow ( Corvus corone )
Image of page 8
Biology 1510 Georgia Tech School of Biology Fall 2008 Speciation is a gradual process regardless of definition some ambiguity will still persist
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Biology 1510 Georgia Tech School of Biology Fall 2008 What is your goal?
Image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern