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(A) Pleiotropic genes have multiple phen...

(A) Pleiotropic genes have multiple phenotypic effect
(B) Multiple 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 s

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The correct Answer is:
B
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A snapdragon plant homozygous for red flower when crossed with a white flowered plant of the same species produced pink flowers in F_(1) generation. (a) What is the phenotypic expression called ? (b) Work out the cross to show the F_(2) generation when F_(1) was self-pollinated. Give the phenotypic and genotypic ratios of f_(2) generation. (c) How do you compare the f_(2) phenotypic and genotypic ratios with those of Mendelian monohybrid f_(2) ?

A snapdragon plant homozygous for red flower when crossed with a white flowered plant of the same species produced pink flowers in F_(1) generation. (a) What is the phenotypic expression called ? (b) Work out the cross to show the F_(2) generation when F_(1) was self-pollinated. Give the phenotypic and genotypic ratios of f_(2) generation. (c) How do you compare the f_(2) phenotypic and genotypic ratios with those of Mendelian monohybrid f_(2) ?

(a) Explain Polygenic inheritance and Multiple allelism with the help of suitable examples. (b) Phenylketonuria is a good example that explains Pleiotropy Justify.

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ALLEN-GENETICS & MOLECULAR BASIS OF INHERITANCE AND MUTATION-EXERCISE-I (CONCEPTUAL QUESTIONS)
  1. Which of the following disorders is not caused by pleiotropic alleles

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  2. Epistatic gene differs from dominant gene in

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  3. (A) Pleiotropic genes have multiple phenotypic effect (B) Multiple a...

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  4. In a genetic cross having recessive epistasis, F(2) phenotypic ratio w...

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  5. Sickle cell anaemia is due to

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  6. Assertion: In four o'clock or snapdragon plant, a cross between a homo...

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  7. Incomplete dominance is found in

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  8. In Mirabills jalapa , the homozygous white(rr) and Red (RR) flower col...

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  9. A child with mother of A group and father of AB group, will not have t...

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  10. Define epistasis and give one example of this phenomenon. How is the p...

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  11. Possible blood groups of children born to parents having A and AB gr...

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  12. A man with blood group B marries a women with blood group A and their ...

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  13. A child with mother of 'A' blood group and father of 'AB' blood group ...

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  14. If mother has blood group B, fathe has A group, the offspring will be ...

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  15. Two nonallelic genes produces the new phenotype when present together ...

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  16. Sickle cell anemia is

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  17. Both the alleles express in a heterozygote when they are

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  18. In the inheritance of flower colour in dog flower plant, the F(1) had ...

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  19. The three different alleles of human ABO blood types will produce how ...

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  20. Other than pea plants it was found that sometimes the F(1) had phenoty...

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