Natural Selection - Natural Selection Complex Traits...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Natural Selection & Complex Traits Quantitative, or measurable traits Normally distributed o Central tendency (mean) o Regular (predictable) variation Natural selection may change: o Location of distribution (central tendency) o Amount of predictable variation Modes of Selection o Directional selection Distribution of complex trait, such as stature Center of the bell curve Population mean, (mu (u with hook)) Selection against the shortest phenotypes Distribution of trait after selection New population mean Selection for taller humans o Stabilizing selection Selection against the shortest and tallest phenotype End up with new distribution, but the means are the same, but the variance is decreased o Disruptive selection Selection pressure applied to center (average) of distribution Two new distributions Disruptive selection resulting in speciation Selection pressures
Image of page 1

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

View Full Document Right Arrow Icon
New species?
Image of page 2
Image of page 3
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