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प्रश्न
Describe Klinefelter’s syndrome.
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उत्तर
- It is a chromosomal disorder caused by an extra X chromosome in males. Thus genotype of individuals is 44 + XXY. They are described as feminized males.
- The extra chromosome is a result of the non-disjunction of the X-chromosome during meiosis in the formation of the ovum.
- Such an individual is male and has overall masculine development. The voice pitch is harsh and has underdeveloped testis. They are tall with long arms, showing feminine development. Voice pitch is harsh and have under developed testis.
- They are tall with long arms, showing feminine development and no spermatogenesis; therefore, individuals are sterile.
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संबंधित प्रश्न
Why are color-blindness and thalassaemia categorised as Mendelian disorders? Write the symptoms of these diseases seen in people suffering from them.
State any two symptoms of Down’s syndrome.
Write a note on Down’s syndrome.
Give an account of one Mendelian and one chromosomal disorder you have studied.
Match Column I with Column II and select the correct option:
| Column I | Column II | ||
| p. | Pleiotropy | I. | More than two alleles occur at the same locus on homologous chromosomes |
| q. | Multiple alleles | II. | Expression of both the alleles m heterozygous condition |
| r. | Polygenic | III. | Multiple effect of single gene |
| s. | Co-dominance | IV. | Single phenotypic character influenced by more than two genes |
Choose the correct option which appropriately classifies the following disorders into Mendelian and chromosomal disorders:
Colour blindness, Down syndrome, Sickle cell anaemia, Turner syndrome, Thalassemia, Haemophilia, Phenylketonuria, Klinefelter syndrome.
If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
Failure of segregation of chromatids during cell division results in the gain or loss of chromosomes, this is called as ______.
Short stature in females, webbed neck absence of menstrual cycle and sterility are characteristics which of the following disease?
What is the primary cause of chromosomal disorders?
