Why can't we measure genetic variation in a population using observable traits (phenotypes)?
A)Many traits are encoded by multiple genes.
B)Phenotypes are not determined by genes.
C)The environment can also affect the phenotype.
D)All traits are encoded by a single gene.

Question

Quizplus · Accepted Answer

Genetic variation can be caused by differences in DNA sequence, copy number variation, and structural variations. Phenotypes are determined by the interaction between genes and the environment, and therefore cannot give a complete picture of genetic variation in a population. Moreover, many traits are determined by multiple genes, making it difficult to determine the specific genetic variations that are responsible for observed phenotypic differences. Therefore, genetic variation in a population can only be accurately measured by analyzing genetic markers, such as single nucleotide polymorphisms (SNPs), that reflect differences in DNA sequence.

Why Can't We Measure Genetic Variation in a Population Using