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Who carried out several dihybrid crosse...

Who carried out several dihybrid crosses in Drosophila to study genes that were sex-linked?
(a) Morgan
(b) Sutton
(c) Bateson
(d) Punnet

A

Morgan

B

Sutton

C

Bateson

D

Punnet

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Morgan carried out several dihybrid crosses in Drosophila and found F_(2) -rations deviated very significantly from the expected Mendelian ratio. Explain his findings with the help of and example.

During the studies on genes in Drosophila that were sex-linked T.H. Morgan found F2-population phenotypic ratios deviated from expected 9 : 3 : 3 : 1. Explain the conclusion he arrived at.

The following results are obtained in several dihybrid test crosses in an organism considering three genes loci Aa,Bb and Cc. a. In test cross with AaBb the number of recombinants and parental combinations are 50 and 950 respectively. b. In TC with AaCc the number of Rc and PC are 75 and 425 respectively. c. In TC with BbCc the number of RC and PC are 160 and 640 respectively. basing on the above result identify the gene loci of the three genes /prepare a genetic map of the three genes.

Term 'Pure line' was coined by (a) Mendel (b) Johannsen (c) Bateson (d) T.H. Morgan

During the studies on genes in Drosopila that were sex-linked T.H. Morgan found F2-populabon phenotypic ratios deviated from expected 9 : 3 : 3 : 1. Explain the conclusion he arrived at.

(a) Dihybrid cross between two garden pea plant one homozygous tall with round seeds and the other with wrinkled seeds was carried. (i) Write the genotype and phenotype of the F_(1) progeny obtained from this cross. (ii) Give the different types of gametes of the F_(1) progeny. (iii) Write the phenotypes and its ratios of the F_(2) generation obtained in this cross along with the explanation provided by Mendel. (b) How were the observations of F_(2) progeny of dihybrid crosses in Philosophical by Morgan different from that of Mendel carried in Pea plants ? Explain giving reasons.

Fluid mosaic model was given by (a) Knoll and Ruska (b) Singer and Ruska (c) Singer and Nicolson (d) Bateson and Punnet

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AAKASH INSTITUTE ENGLISH-PRINCIPLES OF INHERITANCE AND VARIATION-Exercise
  1. The term gene for Mendellan factor was coined by

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  2. Morgan used Drosophila as experimental material because (a) It cannot ...

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  3. Who carried out several dihybrid crosses in Drosophila to study genes...

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  4. Female Drosophila is (a) Smaller in size than male (b) Larger in siz...

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  5. Find the odd one out w.r.t complete linkage

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  6. A condition where an individual heterozygous for two pairs of linked g...

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  7. How many linkage groups are present in human male? (a) 24 (b) 23 ...

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  8. What is the recombination percentage between gene y and w in Drosophi...

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  9. Find the incorrect statement w.r.t chromosomal mapping

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  10. Individuals having homomorphic sex-chromosomes produce (a) One type of...

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  11. Holandric genes are present on (a) X-chromosomes (b) Y-chromosomes ...

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  12. Mark the incorrect pair (w.r.t sex determination) (a) ZW-ZZ type - Fi...

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  13. 50% sperms are devoid of sex-chromosomes in (a) Melandrium (b) Mo...

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  14. In the XX-XO type of sex chromosomes in (a) Females produce only o...

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  15. Select the odd one out w.r.t genic balance theory of sex-determinatio...

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  16. Environmental mechanism of sex-determination is seen in

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  17. Select the odd one out w.r.t haemophilia

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  18. Select the correct match

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  19. All sex limited traits, except

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  20. Mark the odd one wrt chromosomal disorder

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