$A$ person who has $47$ chromosomes due to an extra $X$ chromosome is affected by

Number of chromosomes in Down's syndrome are

What would be the number of chromosomes in the ovum (fertilized by a normal sperm) that resulted in the appearance of Klinefelter's syndrome in the offspring?

In which one of the following combinations $(a - d)$ the number of chromosomes of the present-day hexaploid wheat is correctly represented?

Explain the difference between Euploidy and Aneuploidy.

Which chromosomal aberration does the following figure indicate?