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A newly discovered, recessively-inherited disease-susceptibility trait (DS) is observed only in
cotton plants with white flowers, although the flower colour (R) and DS are independently
inherited. In a breeding programme, one variety that is homozygous for the absence of DS, but
heterozygous for R was mated to another having white flowers but heterozygous for DS. What is
the probability that a given plant among the cross progeny will be susceptible to the disease?
  • a)
    25 %
  • b)
    12.5 %
  • c)
    75 %
  • d)
    0 %
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A newly discovered, recessively-inherited disease-susceptibility trait...
-Upland cottons (Gossypium hirsutum) in general are considered to be highly resistant to the pathogen (Alternaria macrospora) whereas varieties of American Pima cotton (G. barbadense) are considered to be susceptible.
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Most Upvoted Answer
A newly discovered, recessively-inherited disease-susceptibility trait...

Explanation:

Independent Inheritance of Flower Color (R) and Disease-Susceptibility Trait (DS):
- The flower color (R) and disease-susceptibility trait (DS) are independently inherited, meaning they are not linked genes and segregate independently during gamete formation.

Genotypes of Parental Varieties:
- One parental variety is homozygous for the absence of DS (rr) but heterozygous for R (Rr).
- The other parental variety has white flowers (rr) and is heterozygous for DS (Dd).

Punnett Square Analysis:
- When these two varieties are crossed, the Punnett square will show all offspring will be heterozygous for DS (Dd) and either homozygous dominant (RR) or heterozygous (Rr) for flower color.
- None of the offspring will be homozygous recessive for DS (dd) since one parent is homozygous for the absence of DS.

Probability of Disease Susceptibility:
- Since none of the offspring will be homozygous recessive for DS (dd), the probability of a given plant among the cross progeny being susceptible to the disease is 0%.
- Therefore, the correct answer is option 'D' - 0%.
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A newly discovered, recessively-inherited disease-susceptibility trait (DS) is observed only incotton plants with white flowers, although the flower colour (R) and DS are independentlyinherited. In a breeding programme, one variety that is homozygous for the absence of DS, butheterozygous for R was mated to another having white flowers but heterozygous for DS. What isthe probability that a given plant among the cross progeny will be susceptible to the disease?a)25 %b)12.5 %c)75 %d)0 %Correct answer is option 'D'. Can you explain this answer?
Question Description
A newly discovered, recessively-inherited disease-susceptibility trait (DS) is observed only incotton plants with white flowers, although the flower colour (R) and DS are independentlyinherited. In a breeding programme, one variety that is homozygous for the absence of DS, butheterozygous for R was mated to another having white flowers but heterozygous for DS. What isthe probability that a given plant among the cross progeny will be susceptible to the disease?a)25 %b)12.5 %c)75 %d)0 %Correct answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about A newly discovered, recessively-inherited disease-susceptibility trait (DS) is observed only incotton plants with white flowers, although the flower colour (R) and DS are independentlyinherited. In a breeding programme, one variety that is homozygous for the absence of DS, butheterozygous for R was mated to another having white flowers but heterozygous for DS. What isthe probability that a given plant among the cross progeny will be susceptible to the disease?a)25 %b)12.5 %c)75 %d)0 %Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A newly discovered, recessively-inherited disease-susceptibility trait (DS) is observed only incotton plants with white flowers, although the flower colour (R) and DS are independentlyinherited. In a breeding programme, one variety that is homozygous for the absence of DS, butheterozygous for R was mated to another having white flowers but heterozygous for DS. What isthe probability that a given plant among the cross progeny will be susceptible to the disease?a)25 %b)12.5 %c)75 %d)0 %Correct answer is option 'D'. Can you explain this answer?.
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