Q: An individual with down's syndrome has 47 of what instead of the normal 46?


Read this paragraph and choose the correct option from the provided answers:

16.9 Human genetic disorders Down's Syndrome(Mongolism) Down's Syndrome is usually produced by the nondisjunction of chromosome 21 during oogenesis and sometimes during spermatogenesis. The individual suffering from this type of syndrome has 47 chromosomes instead of the normal 46. The extra chromosome is not a sex chromosome but an autosome. Most cases of mongolism were found to occur in children born by women in their forties. The affected children, called mongoloids, show mental retardation and have a shorter life expectancy. Their most prominent feature is the Mongolian folds in their eyes; hence, the term mongolism. Klinefelter's Syndrome.

 Choices:

- ribosomes

- mitochondria

- prokaryotes

- chromosomes


A:
chromosomes