Explain in detail how the Structure of a cell membrane
determine which substances can
pass through it

You can tell from this karyotype that the individual is female because the karyotype has two chromosomes labeled

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system