Class 12 Exam > Class 12 Questions > A) Pleiotropic genes have multiple phenotypic...
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A) Pleiotropic genes have multiple phenotypic effect.
(B) Muliple alleles exhibit same phenotypic expression.
(C) Polygenes exhibit continuous variation.
- a)Statement (A), (B) and (C) are correct
- b)Statement (A), (C) correct and (B) is incorrect
- c)Statement (A), (B) and (C) are incorrect
- d)Statement (B) and (C) are correct and (A) is incorrect
Correct answer is option 'B'. Can you explain this answer?
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A) Pleiotropic genes have multiple phenotypic effect.(B) Muliple allel...
Explanation:
Statement (A): Pleiotropic genes have multiple phenotypic effects.
Pleiotropy refers to the phenomenon where a single gene can have multiple effects on the phenotype of an organism. These effects can be seen in different traits or characteristics. For example, a gene that affects the color of a flower may also affect the shape of its petals. Therefore, statement (A) is correct.
Statement (B): Multiple alleles exhibit the same phenotypic expression.
Alleles are alternative forms of a gene that occupy the same locus or position on a chromosome. Multiple alleles can exist for a gene in a population. However, in most cases, each allele has a different effect on the phenotype. For example, in the ABO blood group system, there are three alleles (IA, IB, and i) that determine the different blood types (A, B, AB, and O). Each allele has a different effect on the phenotype, and therefore, statement (B) is incorrect.
Statement (C): Polygenes exhibit continuous variation.
Polygenes are multiple genes that contribute to the expression of a single trait. These genes may have additive effects, meaning that each gene adds a small amount to the phenotype. This results in a continuous range of phenotypic variation, where individuals can fall anywhere along a spectrum. For example, height in humans is influenced by multiple genes, and individuals can vary in height from very short to very tall. Therefore, statement (C) is correct.
Conclusion:
Based on the explanations above, we can conclude that statement (A) and (C) are correct, while statement (B) is incorrect. Therefore, the correct answer is option 'B': Statement (A) and (C) are correct, and statement (B) is incorrect.
Statement (A): Pleiotropic genes have multiple phenotypic effects.
Pleiotropy refers to the phenomenon where a single gene can have multiple effects on the phenotype of an organism. These effects can be seen in different traits or characteristics. For example, a gene that affects the color of a flower may also affect the shape of its petals. Therefore, statement (A) is correct.
Statement (B): Multiple alleles exhibit the same phenotypic expression.
Alleles are alternative forms of a gene that occupy the same locus or position on a chromosome. Multiple alleles can exist for a gene in a population. However, in most cases, each allele has a different effect on the phenotype. For example, in the ABO blood group system, there are three alleles (IA, IB, and i) that determine the different blood types (A, B, AB, and O). Each allele has a different effect on the phenotype, and therefore, statement (B) is incorrect.
Statement (C): Polygenes exhibit continuous variation.
Polygenes are multiple genes that contribute to the expression of a single trait. These genes may have additive effects, meaning that each gene adds a small amount to the phenotype. This results in a continuous range of phenotypic variation, where individuals can fall anywhere along a spectrum. For example, height in humans is influenced by multiple genes, and individuals can vary in height from very short to very tall. Therefore, statement (C) is correct.
Conclusion:
Based on the explanations above, we can conclude that statement (A) and (C) are correct, while statement (B) is incorrect. Therefore, the correct answer is option 'B': Statement (A) and (C) are correct, and statement (B) is incorrect.
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A) Pleiotropic genes have multiple phenotypic effect.(B) Muliple alleles exhibit same phenotypic expression.(C) Polygenes exhibit continuous variation.a)Statement (A), (B) and (C) are correctb)Statement (A), (C) correct and (B) is incorrectc)Statement (A), (B) and (C) are incorrectd)Statement (B) and (C) are correct and (A) is incorrectCorrect answer is option 'B'. Can you explain this answer?
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A) Pleiotropic genes have multiple phenotypic effect.(B) Muliple alleles exhibit same phenotypic expression.(C) Polygenes exhibit continuous variation.a)Statement (A), (B) and (C) are correctb)Statement (A), (C) correct and (B) is incorrectc)Statement (A), (B) and (C) are incorrectd)Statement (B) and (C) are correct and (A) is incorrectCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A) Pleiotropic genes have multiple phenotypic effect.(B) Muliple alleles exhibit same phenotypic expression.(C) Polygenes exhibit continuous variation.a)Statement (A), (B) and (C) are correctb)Statement (A), (C) correct and (B) is incorrectc)Statement (A), (B) and (C) are incorrectd)Statement (B) and (C) are correct and (A) is incorrectCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A) Pleiotropic genes have multiple phenotypic effect.(B) Muliple alleles exhibit same phenotypic expression.(C) Polygenes exhibit continuous variation.a)Statement (A), (B) and (C) are correctb)Statement (A), (C) correct and (B) is incorrectc)Statement (A), (B) and (C) are incorrectd)Statement (B) and (C) are correct and (A) is incorrectCorrect answer is option 'B'. Can you explain this answer?.
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ample number of questions to practice A) Pleiotropic genes have multiple phenotypic effect.(B) Muliple alleles exhibit same phenotypic expression.(C) Polygenes exhibit continuous variation.a)Statement (A), (B) and (C) are correctb)Statement (A), (C) correct and (B) is incorrectc)Statement (A), (B) and (C) are incorrectd)Statement (B) and (C) are correct and (A) is incorrectCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Class 12 tests.
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