Biological difference between females and males.
Nitrogen bases; adenine, thymine, guanine and cytosine.
Answer: option B - some gametes may have an extra copy of some genes.
Explanation:
Actually, nondisjunction occurs in meiosis and results in FOUR ABNORMAL GAMETES/DAUGHTER CELLS: two gametes have an EXTRA copy of gene e.g XXY, while two other gametes LACK a required copy e.g XO
So, the right answer is some gametes may have an extra copy of some genes.
What year or grade ur in?
A river that comes from rain, glaicers etc would be a good example of fresh water rivers. Cause the water is coming from something that is most likely been unthouched by man or has been filterd and cleaned from minerals in the ground.
