GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is a mistake.
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A mutation occurred.
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The parents were heterozygous, and the white flower is the expression of the recessive alleles.
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White flowers are an adaptation to help with survival.
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Detailed explanation-1: -Answer and Explanation: If the offspring of two heterozygous red-flowering plants are allowed to breed, the cross would result in both red-flowered and white-flowered plants (b). Because the question specifies that R is dominant to r, we can postulate that this gene exhibits a pattern of complete dominance.
Detailed explanation-2: -The crossing of a red flowered plant and a white flowered plant produces all the offspring with pink flowers. This cross illustrates red and white exhibit incomplete dominance. This situation occurs due to the blending of both the alleles.
Detailed explanation-3: -Heterozygous means that an organism has two different alleles of a gene. For example, pea plants can have red flowers and either be homozygous dominant (red-red), or heterozygous (red-white). If they have white flowers, then they are homozygous recessive (white-white).
Detailed explanation-4: -When a red flowered plant is crossed with a white flowered plant, ideally the offsprings should bear either red and white flower. However, in the case where the trait flower color exhibits incomplete dominance, all the offsprings will give forth pink colored flowers due to the blending of traits.