Down's syndrome is an example of
Anueploidy
Polyteny
Polyploidy
Monoploidy
In man, which of the following genotypes and phenotypes may be the correct result of aneuploidy in sex chromosomes?
Gynaecomastia is the symptom of
The number of chromosomes in Down's syndrome is
Broad palm with single palm crease is visible in a person suffering from-
Down’s syndrome is caused by an extra copy of chromosome number $21$. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder