PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The red flower allele is recessive to the white allele.
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The red and white flower alleles are codominant.
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The red flower allele is dominant to the white allele.
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The red flower allele is incompletely dominant to the white allele.
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Detailed explanation-1: -When this flowering plant is self-pollinated, it produces new plants with either red flowers, white flowers, or white flowers with red spots. What is the most likely explanation for this phenomenon? The red flower allele is recessive to the white allele.
Detailed explanation-2: -Explanation: The genotypes of the offspring can be determined by crossing the red flowers, RR, with the white flowers, rr. Offspring: all offspring are Rr. Incomplete dominance means that neither color shows dominance in the hybrid generation.
Detailed explanation-3: -When a homozygous red flowered pea plant is crossed with homozygous white flowered pea plant, all offspring’s will be red flowered.
Detailed explanation-4: -Explanation: Incomplete dominance is an example of a non-mendelian trait (doesn’t follow the genetic rules established by Gregor Mendel). When two parents mate and produce offspring, the offspring is a blend of the two parents. So, a red flower and a white flower would make a pink flower.