Humans, like all mammals, are diploid organisms. This means that we have two copies of each chromosome. In diploid organisms, one somatic cell would have two copies of each gene. This means that in one somatic cell, an individual carries two copies of alleles for long eyelashes, and also two copies of alleles for short eyelashes.
Nearsightedness is the answer.
I think that the answer is 40...................................
A direct observation is usually something that you see with your own eyes
The answer to your question is c!