What were the two experiments that disprove spontaneous generation?

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because

How would you describe an allele that be expressed and determines an organisms appearance? a. uncapitalized b. responsive c. recessive d. dominant