21 trisomy in humans causes | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Down's syndrome is a genetic disorder caused by the presence of an extra copy of chromosome $21$ (trisomy $21$).This condition occurs due to the f

Vedclass · Accepted Answer

Down's syndrome

Vedclass · Answer

(B) Down's syndrome is a genetic disorder caused by the presence of an extra copy of chromosome $21$ (trisomy $21$).This condition occurs due to the failure of segregation of homologous chromosomes during meiosis,leading to an individual having $47$ chromosomes instead of the normal $46$.Key features include mental retardation,a characteristic facial appearance (such as epicanthal folds),and a protruding tongue.In contrast,Klinefelter's syndrome $(44+XXY)$ and Turner's syndrome $(44+XO)$ are sex-chromosomal disorders,while Patau's syndrome is caused by trisomy of chromosome $13$.

$21$ trisomy in humans causes

Similar Questions

If somatic cells of a human male contain a single Barr body,the genetic composition of the person would be:

$A$: Turner's syndrome generally does not occur in males.
$R$: Foetus with $44 + YO$ complement generally dies.

$A$ female with $XXXX$ chromosomes will have the following number of Barr bodies:

$A$ condition characterized by not having an exact number of chromosomes in a diploid set is called

The number of chromosomes in Down's syndrome is

Vedclass Test Series

Exam Paper Generator

Online Exam Module