Flower Diameter in Sunflowers Is a Quantitative Trait

question 30

Multiple Choice

Flower diameter in sunflowers is a quantitative trait. A plant with 6-cm flowers, from a highly inbred strain, is crossed to a plant with 30-cm flowers, also from a highly inbred strain. The F₁ have 18-cm flowers. F₁ × F₁ crosses yield F₂ plants with flowers ranging from 6 to 30 cm in diameter, in approximately 4-cm intervals (6, 10, 14, 18, 22, 26, 30) . The number of different genes influencing flower diameter in this plant is:

• A) three.
• B) four.
• C) five.
• D) six.
• E) seven.

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