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प्रश्न
If the number of chromosomes in an endosperm cell is 27, what will be the chromosome number in the definitive nucleus?
- 9
- 18
- 27
- 36
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उत्तर
(b) 18
Endosperm is triploid (3n) = 27. Hence, n = 9. Definitive nucleus, i.e. the secondary nucleus is diploid, i.e. 2n. Therefore, the number of chromosomes is 18.
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संबंधित प्रश्न
Who had proposed the chromosomal theory of inheritance?
Describe the structure of chromosomes with a suitable diagram.
Classify the chromosomes on the basis of position of centromere.
Describe the structure of sex-chromosomes.
Short Answer Question.
Explain the chromosomal theory of inheritance.
From the following identify the statements that are CORRECT with respect to homologous and non-homologous region of X and Y chromosomes.
i. Non-homologous region of X chromosome is longer and contains more genes than that of non-homologous region of Y chromosome.
ii. X-linked genes are present on nonhomologous region of X-chromosome.
iii. Y-linked genes are present on homologous region of Y-chromosome.
iv. Crossing over occurs only between homologous regions of X and Y chromosomes.
Experimental verification of ‘chromosomal theory of inheritance’ was done by ______.
Which of the following statements indicates parallelism in genes and chromosomes?
- They occur in pairs.
- They segregate during gamete formation.
- They show linkage.
- Independent pairs segregate independently.
Who postulated the 'Chromosomal theory of inheritance'?
Experimental verification of the chromosomal theory of inheritance was done by ______.
