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Absence or excess or abnormal arrangemen...

Absence or excess or abnormal arrangement of one or more chromosomes results in

A

Point mutation

B

Chromosomal disorders

C

Mendelian disorders

D

Gene mutation

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The correct Answer is:
B
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Chromosomal disorders are caused due to absence or excess or abnormal arrangement of one or more chromosomes. Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome, and is called aneuploidy. Failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes in an organism and, this is known as polyploidy. Turner's syndrome is caused due to ............... of one of the X chromosome.

Chromosomal disorders are caused due to absence or excess or abnormal arrangement of one or more chromosomes. Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome, and is called aneuploidy. Failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes in an organism and, this is known as polyploidy. There are a total number of .......... pairs of autosomes in a normal human cell.

The cause of chromosomal disorders is absence or excess of abnormal arrangement of one of more chromosomes. Analysis of karyotypes is used to study the chromosomal disorders. l(aryotype is defined as the profile of an individual's chromosomes that are arranged according to their shape, size and number. Case - Sarika encountered a teenager with short stature and a small round head, furrowed tongue and partially open mouth The palm of the person is broad with characteristic palm crease. She has a doubt that the individual might be suffering from a Chromosomal disorder. On the basis of your reading, answer the following questions: Name the syndrome from which the given individual might be suffering. Describe it along with its symptoms.

Trissomy of 21st chromosome results in

Absence of one sex chromosome causes

AAKASH INSTITUTE-PRINCIPLES OF INHERITANCE AND VARIATION-Assignment (SECTION-A)
  1. Individuals having homomorphic sex-chromosomes produce

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  2. Which of the following phenomena leads to variation in DNA ?

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  3. Sickle cell-anaemia disorder arises due to

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  4. In pedigree analysis, symbol given for sex unspecified is

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  5. Cystic fibrosis, Myotonic dytrophy and Thalassemia are

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  6. Which of the following trait shows transmission from carries femal...

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  7. Phenylketonuria is an inborn error of metabolism that is inherited as

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  8. Which of the following abnormalities is due to autosomal dominant mu...

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  9. Absence or excess or abnormal arrangement of one or more chromosomes ...

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  10. Mark the odd one w.r.t syndrome which occurs due to failure of segreg...

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  11. Heterozygous round and yellow seeded pea plants were selfed and tota...

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  12. Which of the disorder is related with the Karyotype given below ?

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  13. Mark the correct match

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  14. Physical , psychromotor and mental development is retarded in an indi...

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  15. In which of the following disorder's affected individual's posses ...

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  16. The affected individuals are short statured disorder like

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  17. In which of the following disorder gynaecomastiasymptom is seen in i...

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  18. Mark the correct option (w.r.t monosomy)

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  19. Allosomic trisomy condition is seen in

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  20. Which of the following disorder is seen in human female only ?

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