Polygenic Inheritance for plant height
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Name: _________________________ Period: ________ Polygenic Inheritance for plant height Suppose three dominant genes (A, B, and C) control height for a plant. The minimum size of the plant is 4”. Each dominant gene that the plant inherits adds 2” of height. Each recessive gene inherited adds nothing to the height. Below is a Punnett square for a tri-hybrid cross of two 10” tall plants. AaBbCc X AaBbCc ABC ABc AbC Abc aBC abC aBc abc ABC AABBCC AABBCc AABbCC AABbCc AaBBCC AaBbCC AaBBCc AaBbCc ABc AABBCc AABBcc AABbCc AABbcc AaBBCc AaBbCc AaBBcc AaBbcc AbC AABbCC AABbCc AAbbCC AAbbCc AaBbCC AabbCC AaBbCc AabbCc Abc AABbCc AABbcc AAbbCc AAbbcc AaBbCc AabbCc AaBbcc Aabbcc aBC AaBBCC AaBBCc AaBbCC AaBbCc aaBBCC aaBbCC aaBBCc aaBbCc abC AaBbCC AaBbCc AabbCC AabbCc aaBbCC aabbCC aaBbCc aabbCc aBc AaBBCc AaBBcc AaBbCc AaBbcc aaBBCc aaBbCc aaBBcc aaBbcc abc AaBbCc AaBbcc AabbCc Aabbcc aaBbCc aabbCc aaBbcc aabbcc 1. Write the phenotype (total height) for each genotype in the boxes in the Punnett square above. 2. Count up the number of plants that you can expect out of 64 for each height listed and write below. 4” 6” 8” 10” 12” 14” 16” # of each expected _________________________________________________________________________________ 3. Draw a bar graph of the above data on a piece of graph paper, and then attach it to this sheet. Put the plant heights on the horizontal axis and the number expected on the vertical axis.
