PATHOLOGY

PATHOLOGY MCQ

GENETICS AND DISEASE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A red flowering plant is crossed with a white-flowering plant, and only pink-flowering plants are produced. Which of the following explains this pattern of inheritance? (3B3)
A
Multiple alleles
B
Linked genes
C
incomplete dominance
D
Codominance
Explanation: 

Detailed explanation-1: -The white and red sugar flowers are crossed, and produce offspring with pink petals. Which of the following terms describes this type of inheritance? Explanation: Incomplete dominance is described by a phenotype that is not completely dominant over another.

Detailed explanation-2: -When a red-flowered plant is crossed with a white-flowered plant, the F1 generation has pink flowers.

Detailed explanation-3: -He took two true-breeding flower traits (red color as dominant allele and white color as a recessive allele) of four o’clock flowers and crossed them. The results show an intermediate heterozygote with pink color flowers (none of the alleles get dominant). This situation in inheritance is known as incomplete dominance.

Detailed explanation-4: -A pink-flowered plant is crossed with a white-flowered plant. What is the probability of producing a pink-flowered plant? R’ R’ R RR’ RR’ 50% of the offspring have genotype RR’ and 50% have genotype R’R’. This means that 50% of the offspring are white and 50% of the offspring are pink.

Detailed explanation-5: -Answer and Explanation: If a white flower is crossed with that of a red flower, and all of the offspring are red flowers. This would indicate that the white flower has a homozygous recessive genotype.

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