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प्रश्न
Describe the structure of sex-chromosomes.
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उत्तर
Structure of X and Y chromosomes
- X chromosomes are longer than Y chromosomes.
- X chromosome contains large amount of euchromatin and small amount of
heterochromatin, whereas the Y chromosome contains small amount of euchromatin
and large amount of heterochromatin. - Non-homologous region of X-chromosome contains more genes than that of nonhomologous region of Y chromosome.
- Non-homologous region of X-chromosome contains X-linked genes while nonhomologous region of Y chromosome contains Y-linked genes.
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संबंधित 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
Sketch and label the structure of chromosome.
Explain the types of chromosomes on the basis of position of centromere.
Distinguish between X and Y chromosomes.
Short Answer Question.
Explain the chromosomal theory of inheritance.
From the following identify the INCORRECT statement/s with respect to the chromosomes.
i. Chromosomes are capable of self replication and play vital role in heredity, mutation, variation, and evolutionary development of eukaryotic species.
ii. Chromosomes are visible during cell division.
iii. Chemically eukaryotic chromosomes are made of mRNA, histone and non-histone proteins.
iv. The number of chromosomes varies within the population of a particular species.
Extra nuclear chromosomes occur in ______.
Chromosomal theory of inheritance was given by ______.
Experimental verification of ‘chromosomal theory of inheritance’ was done by ______.
A couple has two daughters. What is the probability that the third child will also be a female?
