Question
Select the correct answer from each drop-down menu. The Punnett square illustrates a cross for color of the flower. Based on the phenotypes and genotypes of these offspring, it is clear that purple flower color allele is dominant square and the parents are square heterozygous homozygous dominant homozygous recessive Reset Next
Answer
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Jeffrey
Master · Tutor for 5 years
Answer
To answer the question, we need to understand the basics of genetics and how Punnett squares work.Step 1: Understanding DominanceThe fact that the flower is purple and the letters "Bb" are shown indicates that we are dealing with a simple Mendelian trait with two alleles: one for purple flower color and one for another color (which is not specified but is recessive). The "B" represents the dominant allele for purple color, and the "b" represents the recessive allele for the other color. Since purple is dominant, a flower only needs one "B" allele to be purple.Step 2: Analyzing the Genotype "Bb"The genotype "Bb" means that the organism has one dominant allele ("B") and one recessive allele ("b"). This is the genotype of a heterozygous individual, meaning it has two different alleles for the trait.Step 3: Determining the Parents' GenotypesSince the offspring is heterozygous ("Bb"), we can infer that each parent must have contributed one allele to the offspring. For the offspring to be heterozygous, one parent must have contributed the "B" allele and the other parent must have contributed the "b" allele. This means that each parent must have at least one "B" allele and at least one "b" allele. Therefore, both parents must also be heterozygous ("Bb").Final Answer: The purple flower color allele is dominant (which is indicated by the checkmark), and the parents are heterozygous.