Which of the following is NOT one of Gregor Mendel's principles? *
The alleles for different genes usually segregate independently.
O
Some forms of a gene may be dominant.
The inheritance of characteristics is determined by factors (genes)
Crossing-over occurs during meiosis.

Crossing-over occurs during meiosis

Explanation:

Mendel's principles never mentioned directly how the factors seperate, just that it happened during gamate formation, but nothing about how crossing-over occurs during meiosis.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%