Which of the Following Was NOT One of Mendel's Conclusions

Multiple Choice

Which of the following was NOT one of Mendel's conclusions based on his monohybrid crosses?

A) Genes are carried on chromosomes.
B) Alleles exist in pairs.
C) Alleles segregate equally into gametes.
D) Alleles behave as particles during inheritance.
E) One allele can mask the expression of the other allele.