The right answer is B. Chromosome
In its most scientifically rigorous definition, a chromosome is a fully condensed structure of chromatin.
In optical microscopy, condensed regions formed of heterochromatin and decondensed regions of euchromatin are distinguished on the chromosomes. The genes expressed are located mainly at the level of euchromatin.
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Pioneer 10 also took measurements of the gas giant's magnetosphere, radiation belts, magnetic field, atmosphere, and interior. In 1983, Pioneer 10 became the first human-made object to pass the orbit of Pluto, at that time considered the most distant planet from the sun.
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The correct answer is: Genome-wide association studies.
Genome-wide association study is a study of genome-wide set of genetic variants. It is performed in different individuals in order to see if any variant is associated with a trait. Most commonly observed variants are single-nucleotide polymorphisms (SNPs) and their association with traits like major human diseases.