Mongolism or Down's syndrome occurs when the patients have

Question

Mongolism or Down's syndrome occurs when the patients have (A) 45 chromosomes instead of 46 (B) 44 chromosomes instead of 46 (C) 23 text rd chromosome in three doses (D) nondisjunction of 21 text st chromosome during oogenesis.

Tardigrade Admin · Accepted Answer

Down's syndrome is a congenital disorder and is characterised by the mongoloid facial features, reduced life expectancy and mental retardation. It occurs due to trisomy of 21 text st chromosomes. Its incidence is strongly correlated with maternal age.

Q. Mongolism or Down's syndrome occurs when the patients have

$45$ chromosomes instead of $46$

$44$ chromosomes instead of $46$

$2 3^{rd}$ chromosome in three doses

nondisjunction of $2 1^{st}$ chromosome during oogenesis.

Down's syndrome is a congenital disorder and is characterised by the mongoloid facial features, reduced life expectancy and mental retardation. It occurs due to trisomy of $2 1^{st}$ chromosomes. Its incidence is strongly correlated with maternal age.

Q. Mongolism or Down's syndrome occurs when the patients have

45 chromosomes instead of 46

44 chromosomes instead of 46

23rd chromosome in three doses

nondisjunction of 21st chromosome during oogenesis.

Down's syndrome is a congenital disorder and is characterised by the mongoloid facial features, reduced life expectancy and mental retardation. It occurs due to trisomy of 21st chromosomes. Its incidence is strongly correlated with maternal age.

$45$ chromosomes instead of $46$

$44$ chromosomes instead of $46$

$2 3^{rd}$ chromosome in three doses

nondisjunction of $2 1^{st}$ chromosome during oogenesis.

Down's syndrome is a congenital disorder and is characterised by the mongoloid facial features, reduced life expectancy and mental retardation. It occurs due to trisomy of $2 1^{st}$ chromosomes. Its incidence is strongly correlated with maternal age.