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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
Name the type of cell division involved in the production of sperms by honey bees.
Answer the following question.
Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Bovery with that of experimental results on pea plant presented by Mendel.
If the haploid number in a cell is 18. The double monosomic and trisomic number will be
Identify the scientists who proposed chromosomal theory of inheritance.
Match the column I (Type of chromosome) with column II (name of chromosome).
| Type of chromosome | Name of chromosome | ||
| i. |  |
P. | Acrocentric |
| ii. |  |
Q. | Telocentric |
| iii. |  |
R. | Metacentric |
| iv. |  |
S. | Sub-metacentric |
Chromosomal theory of inheritance was put forth by ______
A gene pair hides the effect of another. The phenomenon is ______.
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.
Which of the following is sex chromosomal disorder?
Which chromosome in the human genome has the highest number of genes?
