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Sex-linked inheritance was discovered by...

Sex-linked inheritance was discovered by
1. Tjio and Levan in human
2. T.H. Morgan in Drosophila
3. Haldane through pedigree analysis in human
4. H.J. Muller in Drosophila

A

Tjio and Levan in human

B

T.H. Morgan in Drosophila

C

Haldane through pedigree analysis in human

D

H.J. Muller in Drosophila

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The correct Answer is:
B
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In Drosophila, XXY is female. In humans it represents a male because 1. Y-chromosome induces male traits in humans. 2. Y-chromosome is essential for female sex in Drosophila. 3. Y-chromosome is not essential for male sex in humans. 4. None of the above

In humans, red-green colour blindness is recessive and sex-linked, while albinism is recessive and autosomal. A marriage between two homozygous parents a normal visioned albino woman and a colour blind and normally pigmented man will produce children 1. who are all phenotypically normal visioned and have normal pigmentation 2. half of whom are colour-blind and the other half having normal vision and all of them having normal pigmentation 3. all of whom have normal vision, but half of whom are albino and the other half with normal pigmentation. 4. of four categories, normal visioned, pigmented, normal visioned, albino, colour blind, pigmented, colour blind, albino, all in equal proportions

Haemophilia is a sex linked recessive disorder of humans. The pedigree chart given below shows the inheritance of Haemophilia in one family. Study the pattern of inheritance and answer the questions given. (a) Give all the possible genotypes of the members 4, 5 and 6 in the pedigree chart. (b) A blood test shows that the individual 14 is a carrier of haemophilia. The member numbered 15 has recently married the member numbered 14. What is the probability that their first child will be a haemophilic male ? Show with the help of Punnett square.

Consider the following relations: R = {(x, y) | x, y are real numbers and x = wy for some rational number w}; S={(m/n , p/q)"m , n , pandqa r ei n t e g e r ss u c ht h a tn ,q"!="0andq m = p n"} . Then (1) neither R nor S is an equivalence relation (2) S is an equivalence relation but R is not an equivalence relation (3) R and S both are equivalence relations (4) R is an equivalence relation but S is not an equivalence relation

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.

In the given pedigree, what the shaded symbols indicate 1. Dominant 2. recessive epistasis 3. Codominant 4. Sex linked recessive

A cross of white eyed female and red eyed male drosophila gives red eyed females and white eyed males. Rarely this cross may give all white eyed females and red eyed males. This was found to be due to 1. loss of a sex chromosome 2. non disjunction of X chromosomes in female 3. mutation in female fly 4. mutation in male fly

TRUEMAN BIOLOGY-PRINCIPLES OF INHERITANCE AND VARIATIONS -MCQs
  1. Who is known as the father of blood group studies?

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  2. The blood of a person having group A can not be tranfused into a perso...

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  3. Sex-linked inheritance was discovered by 1. Tjio and Levan in human 2...

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  4. Rh (-ve) person has 1. Rh antigens on RBC 2. Rh antibodies in Plasma ...

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  5. Trisomy of D-group chromosomes causes 1. Cri-du-chat syndrome 2. Pata...

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  6. Tay sach's disease is

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  7. Which of the following disorder shows Criss-cross inheritance ?

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  8. Number of barr bodies present in turner's syndrome is

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  9. A male grasshopper will have a sex compliment of

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  10. Sex chromosomes are also called

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  11. Two crosses between the same pair of genotype or phenotypes in which t...

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  12. Albinism is due to nonsynthesis (absence) of melanin on account of abs...

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  13. Scientist who was awarded Nobel prize for finding genes to be linearly...

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  14. Christmas disease is another name of 1. Turner syndrome 2. Down's sy...

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  15. Given below is a pedigree chart of a family with five children. It sho...

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  16. Given below is the representation of a kind of chromosomal mutations ...

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  17. Two genes R and Y are located very close on the chromosomal linkage ma...

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  18. In pea plants, yellow seeds are dominant to green. If a heterozygous y...

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  19. In maize, hybrid vigour is exploited by

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  20. A human male produces sperms with the genotypes AB, Ab, aB, and ab per...

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