The crossing over mechanism of genetic variation results from the exchange of gene segments between non sister chromatids. The correct answer is A.
Answer: Glucose, fructose, and galactose each has twice the number of hydrogen atoms as the number of oxygen atoms.
Explanation: I hope this help
C) provides the instructions for making proteins.
this because the main role of DNA is to provide instructions for Development and functions of living cells.so in this question you have to weigh which is the best answer that suits DNA role defination.
