A botanist has acquired a group of sweet pea plants. All of the plants have yellow pea pods (the recessive trait), except for one, which has green pea pods (the dominant trait). Pea pod color is a trait caused by a single gene. In this tutorial, you will determine how the botanist can identify the genotype of the green pea pod, and how this relates to Mendel’s laws and meiosis.

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Part A - Identifying the genotype
How could the botanist best determine whether the genotype of the green-pod plant is homozygous or heterozygous?



Part B - Diagramming a cross using a Punnett square
Punnett squares can be used to predict the two possible outcomes of the botanist’s test cross. The Punnett square on the left shows the predicted result if the unknown plant is homozygous (GG); the Punnett square on the right shows the predicted result if the unknown plant is heterozygous (Gg).

Parts C and D:


asked Nov 20, 2012 in Genetics by GeneX ~Top Expert~ (7,933 points)
edited Nov 21, 2012 by GeneX

1 Answer

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Part A:

 Cross the green-pod plant with a yellow-pod plant.


Part B:



answered Nov 21, 2012 by GeneX ~Top Expert~ (7,933 points)

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