Question

9) A comparison of the karyotypes of a normal human male and a male sufferer of Down's
syndrome shows the latter to possess
(a) one extra chromosome
(b) two Y chromosomes
(c) one extra pair of chromosomes
(d) twice the normal number of
chromosomes​

Answer 1

Answer:

(a) one extra chromosome

Explanation:

I hope this is right answer.

Answer 2

A comparison of the karyotypes of a normal human male and a male sufferer of Down's  Syndrome shows the latter to possess (a) One extra chromosome.

What is Down's Syndrome?

Down syndrome is a genetic disorder which occurs due to the presence of an additional copy of the chromosome number 21 (Trisomy of 21). It is due to aneuploidy of the autosome. Affected individual is physically and mentally retarded.

Common Symptoms include -

• Short Statured with small round head
• Furrowed Tongue and partially open mouth
• Palm crease
• Mental retardation