Who rediscovered Mendel’s laws?

(1) de Vries

(2) Correns

(3) Von Tschermak

(4) all of these

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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Which of the following statements are correct regarding Chromosomal basis of sex determination?

(i) The mechanism of sex determination in insects is of XO type.

(ii) XX insect is female while XO insect is male.

(iii) The X chromosome is called sex chromosome because it was involved in sex determination.

(iv) Grasshopper has XY type of sex determination.

(v) Man has XX type of sex determination.

(1) (iv), (v)

(2) (i), (ii), (iii), (iv), (v)

(3) (i), (ii), (iii)

(4) (i), (iv), (v)

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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T. H. Morgan worked on the fruit fly, Drosophila melanogaster . Which of the following is not an advantage of this fly?
1. They could be grown on simple synthetic medium in the laboratory.
2. They complete their life cycle in about two years, and a single mating could produce a large number of progeny flies.
3. There was a clear differentiation of the sexes – the male and female flies are easily distinguishable.
4. It has many types of hereditary variations that can be seen with low power microscopes.

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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Pairing and separation of a pair of chromosomes would lead to segregation of a pair of factors they carried. This conclusion was drawn by

(1) Walter Sutton

(2) Theodore Boveri

(3) both (1) and (2)

(4) Thomas Hunt Morgan

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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Among human males _______ chromosome is present but its counterpart is _____ and called ______ chromosome.

(1) Y, bigger, Z

(2) X, smaller, Z

(3) X, smaller, Y

(4) Z, bigger, X

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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Who noticed that the behaviour of chromosomes is parallel to the behaviour of genes?

1.  Temin and Baltimore

2.  Correns and Tschermak

3.  Beadle and Tatum

4.  Sutton and Boveri 

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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Chromosomal theory of inheritance is a combination of

(1) Knowledge of chromosomal segregation with Mendelian principle

(2) Knowledge of Dihybridcross with motion of chromosome

(3) Knowledge of Law of dominance with chromosomal appearance

(4) Knowledge of classical genetics with modern molecular biology

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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Morgan worked with the tiny fruit flies - Drosophila melanogaster, which were suitable for genetical studies, as

a.  They could be grown on simple medium

b.  They complete their life cycle in about two weeks

c.  Single mating could produce a large number of progeny flies

d.  No clear cut sexual dimorphism is found 

1.  Only d is incorrect

2.  Both a and d are incorrect

3.  Only b is correct

4.  Both c and d are incorrect 

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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The initial studies for sex determination were done over

(1) Plants

(2) Insects

(3) Humans

(4) Hen

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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Which of the following statement is correct?

(1) Mendel’s work remained unrecognised till 1920.

(2) Mendel’s work suggested that factors were discrete units.

(3) Mendel provided physical proof of the existence of factors.

(4) He used geographical approaches to solve the problems of biology.

Subtopic:  Chromosomal Basis of Inheritance: Introduction |
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