{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Gauglerlecture4

Gauglerlecture4 - 1 Lect 4-19 a New species arise from...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1) Lect. 4-19 a) New species arise from reproductive isolation, gene flow becomes interrupted b) Allopatric speciation i) Gene flow is inhibited because migration is inhibited. ii) “Geographical barriers” can be a cause iii) mountain ranges separate two species that were once one species and tailed apart. iv) Mutations cause one population to change, and become a new separate species. v) If the barrier is eventually removed, the two new species will NOT be able to interbreed successfully. vi) All in all reproductive isolation brings about speciation c) Sympatric speciation i) THIS DOES NOT INVOLVE A BARRIER. ii) Ecological barriers cause the speciation. iii) Species fill in the small ‘Niches’ that form in nature. iv) ECOLOGICAL ISOLATION v) Non-random mating separated animals that began to favor the new niche. vi) POLYPLOIDY IS ANOTHER WAY. vii)Organisms develop double chromosome numbers in one generation. viii) Spontaneous doubling of odd numbers of chromosomes in HYBRIDS.
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
Image of page 2
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