Question

In genetic diseases like Down syndrome, the cause is often due to the presence of an extra chromosome. Do you think this mutation would occur in meiosis or mitosis? Why?

Give answer in the space provided, using Times New Roman, 12 point font, 1 inch margins. At least 200 Words

Answer 1

• Downs syndrome is the result of a chromasomal abnormality in chromosome 21.
• Trisomy21 is the commonest abnormality of autosomal chromosome is the presence of three instead of two chromosomes in the number 21 pair.The condition is known as Trisomy21.and the resulting condition is mongolism or Downs syndrome,which is characterised by mental retardation,congenital anomalies and abnormal physical feautures.
• The additional chromosome 21 can occur by

            --- non dysfunction when pair of chromosomes or sister chromatids fail to seperate properly           during cell division.

            --- Both mitosis and meiosis involve the ordered distribution of chromosomes to form daughter cells...