Multiple Choice
Two brown-eyed parents have a blue-eyed child. How is this possible?
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13. Mendelian Genetics
Genotype vs. Phenotype
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How can you determine the genotype of a plant showing the dominant phenotype of red color?
A
Measure the intensity of the red color.
B
Analyze the plant's DNA sequence for the red color gene.
C
Cross it with another plant showing the same phenotype.
D
Perform a test cross with a homozygous recessive plant.
Verified step by step guidance1
Understand the concept of a test cross: A test cross involves breeding the individual showing the dominant phenotype with another individual that is homozygous recessive for the trait in question. This helps determine the genotype of the dominant phenotype individual.
Identify the dominant and recessive traits: In this scenario, the red color is the dominant phenotype, and we need to determine if the plant is homozygous dominant (RR) or heterozygous (Rr). The recessive phenotype would be a different color, such as white (rr).
Set up the test cross: Cross the plant with the dominant phenotype (red color) with a plant that is homozygous recessive (white color, rr).
Analyze the offspring: If all offspring show the dominant phenotype (red color), the original plant is likely homozygous dominant (RR). If there is a mix of red and white offspring, the original plant is heterozygous (Rr).
Use a Punnett square to visualize the cross: Create a Punnett square to predict the possible genotypes of the offspring from the test cross. This will help you understand the expected ratios of phenotypes based on the genotype of the original plant.
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