Advertisements
Advertisements
प्रश्न
Identify chromosomal disorder caused due to non-disjunction of the 21st number of chromosomes and enlist its symptoms.
Identify chromosomal disorder caused due to non-disjunction of 21% chromosome and enlist its characteristics.
Advertisements
उत्तर
Down syndrome is usually caused by an error in cell division called non-disjunction. Non-disjunction results in an embryo with three copies of chromosome 21 instead of the usual two.
Common Symptoms (Characteristics) of Down syndrome are:
- Mild or moderate mental retardation and poor skeletal development.
- Distinct facial features like small head, ears and mouth.
- Eyes slant up and out with internal epicanthal folds.
संबंधित प्रश्न
Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross.
Genes for cytoplasmic male sterility in plants are generally located in ______.
Select the incorrect statement regarding pedigree analysis.
Mongolism is a genetic disorder which is caused by the presence of an extra chromosome number ______.
Females with Turner’s syndrome have ______.
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.
The number of Barr bodies present in a female with Turner's syndrome is ______
It is said, that the harmful alleles get eliminated from population over a period of time, yet sickle cell anaemia is persisting in human population. Why?
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?
Which list contains only chromosomal disorders?
