Who rediscovered Mendel’s laws?
(1) de Vries
(2) Correns
(3) Von Tschermak
(4) all of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich 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)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyT. 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.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPairing 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAmong 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWho 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyChromosomal 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMorgan 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe initial studies for sex determination were done over
(1) Plants
(2) Insects
(3) Humans
(4) Hen
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich 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.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology