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Shell coiling in Limnaea shows maternal effect in the progenies. Right-handed shell coiling is controlled by D and is dominant to left-handed coiling which is control by d. A cross between two Limnaea produces progenies of all left-handed. Which of the following is TRUE for the above cross?
  • a)
    The phenotype of the mother is left-handed coiling.
  • b)
    The phenotype of the grandmother is left-handed coiling.
  • c)
    The genotype of the mother is dd.
  • d)
    The genotype of the grandmother is dd.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Shell coiling in Limnaea shows maternal effect in the progenies. Right...
Genotype of the mother determine the progeny phenotype.
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Most Upvoted Answer
Shell coiling in Limnaea shows maternal effect in the progenies. Right...
Explanation:
To determine the genotype of the mother and grandmother in the given cross, we need to analyze the information provided.

Information Given:
- Shell coiling in Limnaea shows maternal effect in the progenies.
- Right-handed shell coiling is controlled by D and is dominant to left-handed coiling which is controlled by d.
- A cross between two Limnaea produces progenies of all left-handed.

Analysis:
Since all the progenies in the given cross are left-handed, this means that both parents must contribute the recessive allele (d) for left-handed coiling. Let's analyze the possibilities for the genotypes of the parents.

Possible Genotypes:
- RR (homozygous dominant) x rr (homozygous recessive)
- RR (homozygous dominant) x Rr (heterozygous)
- Rr (heterozygous) x Rr (heterozygous)

In the first possibility, if the mother is homozygous recessive (rr), then all the offspring will be left-handed (since they inherit one recessive allele from each parent). This aligns with the given information that all the progenies in the cross are left-handed.

Conclusion:
Therefore, from the given options, it can be concluded that the genotype of the mother is dd. The phenotype of the mother or grandmother cannot be determined from the given information.
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Shell coiling in Limnaea shows maternal effect in the progenies. Right-handed shell coiling is controlled by D and is dominant to left-handed coiling which is control by d. A cross between two Limnaea produces progenies of all left-handed. Which of the following is TRUE for the above cross?a)The phenotype of the mother is left-handed coiling.b)The phenotype of the grandmother is left-handed coiling.c)The genotype of the mother is dd.d)The genotype of the grandmother is dd.Correct answer is option 'C'. Can you explain this answer?
Question Description
Shell coiling in Limnaea shows maternal effect in the progenies. Right-handed shell coiling is controlled by D and is dominant to left-handed coiling which is control by d. A cross between two Limnaea produces progenies of all left-handed. Which of the following is TRUE for the above cross?a)The phenotype of the mother is left-handed coiling.b)The phenotype of the grandmother is left-handed coiling.c)The genotype of the mother is dd.d)The genotype of the grandmother is dd.Correct answer is option 'C'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about Shell coiling in Limnaea shows maternal effect in the progenies. Right-handed shell coiling is controlled by D and is dominant to left-handed coiling which is control by d. A cross between two Limnaea produces progenies of all left-handed. Which of the following is TRUE for the above cross?a)The phenotype of the mother is left-handed coiling.b)The phenotype of the grandmother is left-handed coiling.c)The genotype of the mother is dd.d)The genotype of the grandmother is dd.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Shell coiling in Limnaea shows maternal effect in the progenies. Right-handed shell coiling is controlled by D and is dominant to left-handed coiling which is control by d. A cross between two Limnaea produces progenies of all left-handed. Which of the following is TRUE for the above cross?a)The phenotype of the mother is left-handed coiling.b)The phenotype of the grandmother is left-handed coiling.c)The genotype of the mother is dd.d)The genotype of the grandmother is dd.Correct answer is option 'C'. Can you explain this answer?.
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