What was the most important scientific advance gained from gregor mendel's experiments with pea plants? a. we learned that chromosomes are composed of dna. b. we learned that recessive alleles occur more frequently in the f2 generation than do dominant ones. c. we learned that many traits are inherited in discrete units, and are not the result of blending. d. we learned that there is considerable genetic variation in garden peas. e. darwin's theory of evolution by natural selection was confirmed?

The answer is; C

When Mendel coined his law of hereditary, he did not know about genes. He nonetheless observed that offsprings receive one discrete unit of a basic trait from each of the parents. He also observed that genes on different chromosome were inherited independently of each other. This principle was named law of independent assortment.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.