Pioneering work in the field of genetics began prior to the 20th century. however, much of the early work relied only upon simple observation
select the genetics concepts below that were discovered before the year 1900

a. preservation of beneficial traits
b. the location of genes on chromosomes
c. calculation of mendelian inheritance
d. the molecular structure of dna

Answer with Explanation:

Two genetic concepts were discovered before 1900.

a. preservation of beneficial traits (This was discovered by Charles Darwin in 1859. This theory provided the details about how an organisms survives and adapted to new environment.)

c. calculation of Mendelian inheritance (This was discovered by George Mendel in 1865. This law provided the detail about how genetics is inherited to offspring and what happens when traits move from one generation to other generation.)