How many cell layers compose the thickness of the elodea leaf which layer has the largest cell?

How does the study of genetic disorders such as pku biologists understand normal alleles?

Plz ! a frog has a genetic mutation in skin cells that causes part of its skin to turn orange the frog will not pass this genetic mutation onto its offspring because, a. the offspring will inherit skin cells from the other parent. b. mutated skin cells cannot divide and produce daughter skin cells. c. skin cells do not contribute genetic material to sex cells. d. parents do not contribute genetic material to their offspring.

Types of scientific inquiry that biologist engage in that cannot be completely controlled