The crossing over mechanism of genetic variation results from the exchange of gene segments between non sister chromatids. The correct answer is A.
It is false.
Explanation:
Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.
Answer:
A, the sun.
Explanation:
The sun powers the water cycle and many others.
The answer is from another male zygote or his male father.
The correct answer is b, antigens
