异异异异 异异异异—异异异异 异异异 异 体( 体): Allopolyploids : allopolyploid are f ormed from hybrids between closely r elated species. The different sets o f chromosomes are sufficiently diffe rent in DNA sequence not to pair bet ween sets in meiosis. The chromosome number doubles accidentally by faile d mitosis so that each cell has two complete sets of chromosomes from ea ch parent , and these pair like with like, restoring fertility.
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异源多倍体(种间杂交—杂种染色体加倍):
Allopolyploids : allopolyploid are formed from h
ybrids between closely related species. The differen
t sets of chromosomes are sufficiently different in
DNA sequence not to pair between sets in meiosis.
The chromosome number doubles accidentally by f
ailed mitosis so that each cell has two complete sets