GENETICS QUESTION: 1983               L PETERSON/AP BIOLOGY

   State the conclusions reached by Mendel in his work on the inheritance of   

  characteristics. Explain how each of the following deviates from these conclusions:

        A. Autosomal linkage

        B. Sex-linked (X-linked) inheritance

        C. Polygenic (multiple-gene) inheritance

  STANDARDS:

    maximum = 15 points total

    MENDEL (8 points maximum):

     DISCRETE UNITS

     2 FACTORS/TRAIT

     DOMINANT/RECESSIVE

     PUNNETT SQUARE:

        GAMETES HAVE 1 FACTOR

        EQUAL # GAMETES (EACH TYPE)

        FACTORS SEGREGATE WHEN GAMETES FORM (SEGREGATION)

        RANDOM DISTRIBUTION OF FACTORS (INDEPENDENT ASSORTMENT)

     USE OF PROBABILITY

    DEVIATIONS (12 points maximum):

     AUTOSOMAL LINKAGE:    DEFINITION (1)

                          EXAMPLE (1)

                          EXPECTED DEVIATION (1)

     SEX-LINKED:               DEFINITION (1)

                          EXAMPLE (1)

                          EXPECTED DEVIATION (1)

     POLYGENIC:                DEFINITION (1)

                          EXAMPLE (1)

                          EXPECTED DEVIATION (1)