What is a spontaneous change in a gene or a chromosome

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b.organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

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