Which explains how genetic variation occurs by way of sexual reproduction? 1)The union of sperm and egg occurs during meiosis.
2)Half of each chromosome pair comes from each parent
3)Sexual Reproduction does not produce variation
4)Meiosis occurs in all body cells also.

Melissa lives in a town called greendale. she discovers that when she lights a match and holds it near her kitchen faucet, the little flame grows into a larger fire. melissa is surprised because she thought the water would extinguish the flame rather than ignite it further. her mother tells her that the water might be contaminated with dissolved methane, a primary component in natural gas. melissa investigates the matter and finds that cases of methane contamination started shortly after a company began fracking for natural gas in the area. based on this information, which three statements are plausible consequences of fracking in greendale?

What type of genetic drift would be simulated if all the beans that were not selected died out?

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?