Mendel formulated his principles of inheritance based on mendel formulated his principles of inheritance based on a detailed understanding of meiosis, fertilization, and the other chromosomal processes that are involved. observations on the outcomes of breeding experiments. the underlying processes were unknown at the time. existing knowledge of chromosomal processes that he combined with insights from his own breeding experiments. little-known works by earlier scientists. submit

Observations on the outcomes of breeding experiments. The underlying processes were unknown at the time

Explanation:

Mendel gave his principles of inheritance way before concept of chromosomes, genes and alleles came. He crossed pea plants and observed seven different traits. These traits were: plant height, flower colour, flower position, seed shape, seed colour, pod shape and pod colour. According to the results of his experiments, he gave three principles of inheritance: law of dominance, law of segregation and law of independent assortment. He also coined the term "factors" which are known as alleles today. The three laws were also later proved using modern day concepts of genes, chromosomes and chromosomal crossover.

the sphincter muscles at the end of the digestive tract is the anus.