2003 Lecture 12 Types of Selection (1).pdf

2003 Lecture 12 Types of Selection (1).pdf - Announcements...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
2/27/2017 1 Announcements Readings: Minor   project   due   March   3 27 Feb 7 12 Types   of   Selection;   Sexual   Selection Chapters   12   and   13 Feb   22 Feb   27 Minor   Project 1 Mar 13 Behavior   and   Learning;   Communication Chapters   14   and   15 Feb   24 Mar   1 ENTO   2003   Insects   and   Society Lecture   10:   Natural   Selection   and   Sexual   Selection Mechanisms   for   Evolution   of   Populations Charles   Darwin:   Evolution   by   Natural   Selection
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
2/27/2017 2 Four   Observations Individuals   within   a   population   are   variable Four   Observations Some   of   these   variations   are   passed   on   to   offspring   ( heritable )
Image of page 2
2/27/2017 3 Four   Observations Many   more   offspring   are   produced   than   can   survive Extrapolation Blowflies   produced   an   average   of   144   progeny:   half   male,   half   female   Assuming   no   mortality,   a   single   pair   of   flies   could   give   rise   to   10,368   offspring   in   the   third   generation   746,496   in   the   fourth   generation Extrapolation 53,747,712   in   the   fifth   generation 3,869,835,264   in   the   sixth   generation   At   this   rate,   the   fly   population   would   grow   to   more   than   1   X   10 17 individuals   in   one   year   (10   generations) In   two   years   of   continuous   reproduction   the   flies   would   fill   a   ball   nearly   8   million   kilometers   in   diameter   About   600   times   the   size   of   earth! Remember   Chapter   1
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
2/27/2017 4 Not   All   Survive Biotic   factors Competition   and   predation Abiotic   factors Climate,   habitat   and   food   limitation,   catastrophic   events   Four   Observations Survival   and   reproduction   are   not   random Individuals   with   favorable   traits   will   produce   more
Image of page 4
Image of page 5
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