Answer:
An organism's genotype is its specific combination of alleles for a given gene. ... The phenotype is the physical manifestation of an organism's allellic combination (genotype). For the pea plants, if the red allele is dominant and the white allele is recessive, only two phenotypes are possible. It is DNA that contains the genetic code that is used to make proteins. In turn, it is the structure of proteins that determines many of the biological functions and physical characteristics of an organism. Genes are segments of DNA. ... The order of the nucleotides determines the gene that an individual will have.
Explanation:
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