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प्रश्न
If only one 'X' chromosome is found in a female person, which of the following symptoms she will show?
- epicanthal skin fold
- webbing of neck
- small testis and absence of spermatogenesis
- presence of simian crease on the palm
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उत्तर
(b) Webbing of neck
A missing X chromosome leads to Turner’s syndrome. The symptoms in females are a receding lower jaw and a short webbed neck.
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संबंधित प्रश्न
A child suffering from Thalassemia is born to a normal couple. But the mother is being blamed by the family for delivering a sick baby.
- What is Thalassemia?
- How would you counsel the family not to blame the mother for delivering a child suffering from this disease? Explain.
- List the values your counselling can propagate in the families.
Mention any two autosomal genetic disorders with their symptoms.
Give an account of one Mendelian and one chromosomal disorder you have studied.
Identify the disease caused by an autosomal primary non-disjunction.
If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is ______.
A woman with albinic father marries an albinic man. The proportion of her progeny is ______.
Extra chromosome ‘X’ is present in which one of the following cases?
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.
Turner's syndrome is a/an ______
In Down's syndrome, karyotyping has shown that the disorder is associated with trisomy of chromosome number 21 usually due to ______.
Jacob is genetically a carrier of the disorder that affects the shape of the RBCs, as shown in the diagram below. His son James suffers from the same disorder.
- Give the biochemical reason for the disorder that changes the shape of the RBCs, as shown above.
- Draw a Punnett square to show the genotype of the mother of James.
- Name and define the type of 'point mutation' responsible for this disorder.
