Factors Affecting Biological Diversity-Standard Bio 4.4 — Unit test
Question 1 • Fall 24 GSE Biology B-IC
In pea plants, purple flower color, C, is dominant to white flower color, c. The table shows the frequencies of the dominant and recessive alleles in three generations of peas in a garden. Generation 1 has 200 flowers, generation 2 has 400, and generation 3 has 400. Allele Frequency for Flower Color in PeasGenerationpq10.50.520.60.430.70.3Which best describes the number of flowers?
Answer
A
Generation 1 has more white flowers than generation 2.
B
Generation 3 has more white flowers than generation 2.
C
Generation 2 has fewer purple flowers than generation 1.
D
Generation 1 has fewer purple flowers than generation 3.
Explanation
White flowers have genotype cc, so their frequency is q². In generation 1, q = 0.5, giving 200 × 0.5² = 50 white flowers and 150 purple flowers. In generation 3, q = 0.3, giving 400 × 0.3² = 36 white flowers and 364 purple flowers. Therefore, generation 1 has fewer purple flowers than generation 3, so choice D is correct.
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