In humans, normal color vision (X^c) dominates red-green colorblindness (X^c^b). Two parents produce daughters who are all carriers (heterozygous) and sons who are all normal. What are the probable genotypes of the parents?

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