What is the relationship between phenotype and genotype?

A phenotype is the combination of alleles that you have for a certain feature. So a person who suffers from sickle cell disease or cystic fibrosis will have 2 identical recessive alleles coding for a mutation that results in them having the condition (the phenotype).

The phenotype is the observable characteristic someone has as a result of their genotype, so if a plant has one dominant allele and one recessive for height, it will be tall. If it has 2 recessive alleles, it will be short.

These are just examples but I hope you get the idea.

Explanation:

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

the correct answer is 2 and 4