The 1961 Yankees - Roger Maris had 61 and Mickey Mantle had 54.
104
zero
122 different players have had a total of 295 40-HR seasons.
Roger Maris led the Major League in home runs 1 time. It was in 1961 with 61 home runs.
Yastrzemski, Carl (1)
25 players
As many as the players can hit. There is no limit.
104
25
As of 2009, 125 players have hit 300 or more career homer runs in the Major leagues..
2 players hit 40 or more home runs in 2008, both from the National League. R. Howard(47), and A. Dunn (40)
Nobody did
5
zero
It would score 4 (four) runs.
1500
122 different players have had a total of 295 40-HR seasons.