What happens if have less chromosomes?
Fewer than the normal 2N complement of chromosomes invariably results in nonviable offspring.
The presence of only one X chromosome results in an infertile female.
Fewer than the normal number of chromosomes generally results in non-viable offspring. The exception is the sex chromosomes which results in developmentally abnormal, sterile offspring.
In humans one X chromosome is required for viability
If you have one additional pair of CHROMOSOME 23, you have DOWN SYNDROME. If a person has fewer than 46 chromosomes, they will die. With more than 46 chromosomes, it depends on the chromosome type , but mostly disorders or syndromes will occur. Death is also a possibility in this case. Answer The condition wherein the number of chromosomes in a individual is more or less than the expected number of chromosomes is called aneuploidy…
It is because with only 2-3 pairs of chromosomes we would have much less variability (Variability is critical for the existence of a population;less variability, less resistant population). Why more variability? Because we have 23 pairs of chromosomes but they are not two exactly same sets of chromosomes.