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During his studies on genes in Drosophi...

During his studies on genes in Drosophila that were sex-linked, TH Morgan found
`F_(2)` - population phenotypic ratio to be deviated from expected 9 : 3 : 3 : 1 . Explain the conclusion he arrived at

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Conclusion of Morgan.s experiments are
(i) Genes were located on the x- chromosome
(ii) When the two genes in a digybrid cross were studied on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type. Morgan stated this association as .linkage. to describe the physical association of genes on a chromosome
(iii) Morgan and his group also found that even when genes were grouped on the same chromosome, some genes were tightly linked (low recombination) and others were loosely linked (higy recombination )
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Assertion : When yelow bodied, white eyed Drosophila females were hybridised with brown-bodied, red eyeed males , and F_(1) progeny was intercrossed, F_(2) ratio deviated from 9:3:3:1 Reason : When two genes in a dihybrid are on same chromosome, the proportion of parental gene combinations are much higher than the non-parental type

In a dihybrid cross, white-eyed, yellow -bodied female Drosophila was crossed with red-eyed, brown - bodied male Drosophila, produced in F_(2) - generation are 1.3% recombinants and 98.7% progeny with parental type combinations. This observation of Morgan deviated from Mendelian F_(2) - phenotypic dihybrid ratio. Explain giving reasons, Morgan's observations

Morgan hybridised yellow-bodied, white-eyed females to brown-bodied red-eyed males and intercrossed their F_(1) progeny. He observed that (a) F_(2) ratio was deviated very significantly from the 9:3:3:1 ratio (b) Both genes did not segregate independently of each other (c) Recombinant types are not obtained in F_(2) generation (d) Both genes segregate independently of each other Select the correct set of statements :

ARIHANT PUBLICATION-HEREDITY AND VARIATION-Part II Questions For Practice (Short Answer Type Questions )
  1. Explain the phenomenon of multiple allelism and codominance taking ...

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  2. What is the phenotype of the following (a) l^(A) i (b) ii

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  3. A child has blood group O. If the father has blood group A and mother ...

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  4. Explain the following What is the most common example of pleiot...

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  5. Explain the following How are the pleiotropic genes useful ?

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  6. State the significance of crossingover.

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  7. What is Chiasma ?

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  8. What is likage? mention it's Significance.

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  9. Write a short notes on: Crossing over

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  10. Define multiple allelism

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  11. During his studies on genes in Drosophila that were sex-linked, TH ...

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  12. List three different allelic forms of gene 'I' in human . Explain th...

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  13. A woman with blood group 'A' marries a man with blood group 'O' . Di...

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  14. A woman with blood group 'A' marries a man with blood group 'O' . Di...

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  15. blood group are called universal recipient.

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  16. Explain ABO blood group?

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  17. Inheritance pattern of flower colour in garden pea plant and snapdrago...

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  18. Explain the genetic basis of blood grouping in human population

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  19. Can a child have blood group o if his parents have blood group A and b...

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  20. How do genes and chromosomes share similarity from the point of view ...

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