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Test: MCAT Biology
Pea plants have two independently assorted genes that code for seed shape (round or wrinkled) and seed color (yellow or green), respectively. A researcher crosses two pea plants and observes that all F1 offspring have the same phenotype: round shape and yellow seeds. He then performs a test cross with an F1 offspring and observes four different phenotypes in a 1:1:1:1 ratio. Based on this information the researcher concludes the genotypes of the parents.
1. | Which of the following is the correct pairing of recessive alleles? |
Round and yellow
Round and green
Wrinkled and yellow
Wrinkled and green
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