Question
Which cotton species is recognized as "American cotton"
or "Upland cotton" and has an allelotetraploid chromosome number?Solution
Gossypium hirsutum is commonly known as "American cotton" or "Upland cotton" and has an allelotetraploid chromosome number of 2n=4x=52. Its fiber length ranges from 18.0 to 23.0.
130 114 106 102 100 ?
3720 3842 ? 4092 4220 4350
...0Â Â Â Â Â Â 2 Â Â Â Â Â Â Â 6Â Â Â Â Â Â 12 Â Â Â Â Â Â 20Â Â Â Â Â Â Â ?
...17Â Â Â Â Â ? Â Â Â Â Â 2142 Â Â Â Â Â Â 12852 Â Â Â Â Â Â 64260Â Â Â Â Â Â 257040
...133    183    220    ?     263     273
...720    ?     240     180      144     120
...12 7 10 25 107 ?
...125 36 343 ? 729 100
...8   24    12    ?   18     54
10 59 ? 1169 3503 7001
...