Which of the following facts was unknown to Gregor Mendel? a. during reproduction, alleles separate
b. organisms have two alleles for each of their genes
c. alleles for genes are found on chromosomes
d. heterozygous genes have two different alleles

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called