Select incorrect sentence for down's syndrome
Chromosomal disorder
Trisomy of $21^{th}$ pair
Mental development is retarded
It occurs due to crossing over
A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in
Describe chromosomal disorder and describe its examples.
What would be the number of chromosomes in the ovum (fertilized by a normal sperm) that resulted in the appearance of Klinefelter's syndrome in the offspring
In which disorder $XXY$ karyotype is present ?
Physical, psychomotor and mental development is retarted in an individual affected with