Results 1 to 5 of 5

Thread: Clinal Gradations

  1. #1
    Cadet littlemaster's Avatar
    Join Date
    Feb 2006
    HSC
    2007
    Gender
    Male
    Posts
    34
    Rep Power
    9

    Clinal Gradations

    Hey guys,

    well i was reading throughout as my understanding:

    polymorphism is the variety of alleles within a population

    clinal gradation is the presence of overlapping traits.

    So what would be a solid example of a clinal gradation?

    my teacher says its just the difference better one area and another, like the gradual change from equator to poles....but i think thats a cline.

    I even rang the HSC hotline 3DAYS AGO, and they havent got back to me!

    Help appreciated.
    MBBS at UNSW in 2008

  2. #2
    ashleey luvs roosters katie tully's Avatar
    Join Date
    Jun 2008
    HSC
    2005
    Gender
    Female
    Location
    My wrist is limp
    Posts
    5,220
    Rep Power
    10

    Re: Clinal Gradations

    HSC Online gives a much better example than I can;

    Clinal gradation occurs as a result of interbreeding and intermediate environments. Clinal gradation is seen in skin colour, eye colour and body stature. A cline is a gradual change in gene frequency in a population. This produces a gradual change in the phenotypic characteristics of a species over a geographical range.

  3. #3
    Junior Member imqt's Avatar
    Join Date
    Aug 2007
    HSC
    2008
    Gender
    Female
    Posts
    236
    Rep Power
    8

    Re: Clinal Gradations

    Quote Originally Posted by littlemaster
    Hey guys,

    well i was reading throughout as my understanding:

    polymorphism is the variety of alleles within a population

    clinal gradation is the presence of overlapping traits.

    So what would be a solid example of a clinal gradation?

    my teacher says its just the difference better one area and another, like the gradual change from equator to poles....but i think thats a cline.

    I even rang the HSC hotline 3DAYS AGO, and they havent got back to me!

    Help appreciated.



    clinal graduation - people living in colder regions have a shorter, stockier stature to reduce heat loss. people living in hoter regions (africa) are taller and thinned to increase surface area and expose extremeties for heat loss

    polymorphism --- you need two examples...mine are LACTOSE INTOLERANCE and SICKLE CELL ANAEMIA (if you need these exaplained let me know)
    BPharmacy 2009

    UAI AIM 96+

  4. #4
    Moderator Kujah's Avatar
    Join Date
    Oct 2006
    HSC
    N/A
    Gender
    Undisclosed
    Posts
    4,758
    Rep Power
    11

    Re: Clinal Gradations

    You got increased frequency of dark-skinned people near the equator and the gradual increase of fair-skinned people as move away.

    The increase of blue-eyed, blonde-haired individuals as move away from the Mediterranean to the Scandinavian nations.

    I just realised this was posted last year.

  5. #5
    New Member
    Join Date
    Oct 2015
    HSC
    2016
    Gender
    Female
    Posts
    3
    Rep Power
    2

    Re: Clinal Gradations

    Quote Originally Posted by imqt View Post
    clinal graduation - people living in colder regions have a shorter, stockier stature to reduce heat loss. people living in hoter regions (africa) are taller and thinned to increase surface area and expose extremeties for heat loss

    polymorphism --- you need two examples...mine are LACTOSE INTOLERANCE and SICKLE CELL ANAEMIA (if you need these exaplained let me know)

    Could you please explain the Lactose intolerance and sickle-cell anaemia examples to me?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •