Question

what is the source of the extra chromosome 21 in an individual with down syndrome? question 5 options: nondisjunction in the mother only nondisjunction in either parent duplication of the chromosome nondisjunction in the father only

Answer 1

Trisomy is the condition responsible for extra set of chromosome in down syndrome and inability of the separation of homologous chromosome during cell division is the cause of non disjunction.

What is down syndrome and non disjunction and what is the  cause of both?

1. Down syndrome is a chromosomal disorder whose trait is in the patient's body by starting.
2. The cause of the down syndrome is additional set of chromosome number 21 resulting into trisomy.
3. Non disjunction is the condition in which the sister chromatids of homologous chromosome do not separate during cell division.
4. Non disjunction also called as aneuploidy , a condition of unequal distribution of chromosomes to daughter cells.

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