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प्रश्न
Describe Klinefelter’s syndrome.
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
Give any 'two' names of X-linked diseases
Give an example of a human disorder that is caused due to a single gene mutation.
Read the following statements and select the correct option.
i. Genetic disorders are broadly categorised as, Mendelian disorders and chromosomal disorders.
ii. Mendelian disorders are caused due to absence or excess of one or more chromosomes or their abnormal arrangement.
iii. Chromosomal disorders are mainly caused due to alteration or mutation in the gene.
A woman with albinic father marries an albinic man. The proportion of her progeny is ______.
If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
Read the following and answer from given below:
Turner's syndrome is an example of monosomy. It is formed by the union of an allosome-free egg and a normal 'X' containing sperm or a normal egg and an allosome-free sperm. The individual has 2n = 45 chromosomes (44 + X0) instead of 46. Such individuals are sterile females who have rudimentary ovaries, underdeveloped breasts, small uterus, short stature, webbed neck, and abnormal intelligence. They may not menstruate or ovulate. This disorder can be treated by giving female sex hormones to women from the age of puberty to make them develop breasts and have menstruation. This makes them feel more normal.
Which of the following statements regarding Turner's syndrome is incorrect?
The technique exployed in human genetic counselling is:
If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father? Comment.
Why is thalassemia cotegorised as a Mendelian disorder? Write the symptoms and explain the causes of the disease. How does it differ from Sickle cell anaemia?
Give the genotype of Klinefelter's syndrome.
