Polyploids contd
The familiar Mendelian ratios apply to genetic segregation in allopolyploids, but not to autopolyploids
Tetrasomic inheritance from selfing of Aaaa:
The numbers indicate the dosage of A in the zygote
AA |
Aa |
Aa |
Aa |
Aa |
aa |
|
AA |
4 |
3 |
3 |
3 |
3 |
2 |
Aa |
3 |
2 |
2 |
2 |
2 |
1 |
Aa |
3 |
2 |
2 |
2 |
2 |
1 |
Aa |
3 |
2 |
2 |
2 |
2 |
1 |
Aa |
3 |
2 |
2 |
2 |
2 |
1 |
aa |
2 |
1 |
1 |
1 |
1 |
0 |
1 AAAA: 8 AAAa: 18 Aaaa: 8 Aaaa: 1 aaaa
or
35 A---: 1 aaaa
Contrast with the familiar diploid Mendelian ratio:
1 AA: 2 Aa: 1 aa
or
3 A- : 1 aa