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Title: How can you determine the genotype of a plant showing dominant phenotype of red color? Post by: ijenniferrr on May 18, 2012 1. The phenotype reflects the genotype, so the plant must be homozygous for the trait
2. cross the red plant with a white plant to see if any white plants appear 3. cross the red plant with other red plants to see if any white plants appear 4. cross the red plant with a white to see how many red plants appear 5.cross the red plant with another red plant, and the cross the F1 population with each other to see if any white plants appear Title: How can you determine the genotype of a plant showing dominant phenotype of red color? Post by: ijmorale on May 18, 2012 2. cross the red plant with a white plant to see if any white plants appear. This is a test cross and assumes red is dominant and white is recessive.
EDIT If you perform cross 5.you need to know the genotype of the other red plant. Title: How can you determine the genotype of a plant showing dominant phenotype of red color? Post by: bugbugs4 on May 19, 2012 2. assuming dominant is red and recessive is white, you can best determine the genotype of a plant showing the dominant phenotype by crossing it with a homozygous recessive (white) plant. If you have any offspring with the white phenotype, you know that the unknown parent is heterozygous. If you only have offspring with the red phenotype you know that the parent is homozygous dominant. Do a Punnett square.
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