In 1950, erwin chargaff discovered that the percentage of adenine in dna equals the percentage of thymine, and that the percentage of cytosine equals the percentage of guanine. this proved invaluable to the eventual discovery of which aspect of dna?

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

Study this image which statement best describes the rock shown check all that apply

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a