Suppose that species I has 2n10 and species II has 2n12 How

Suppose that species I has 2n=10 and species II has 2n=12. How many chromosomes would be present in the allotetraploid?

Solution

Allotetraploid is the condition where hybrid must have chromosomes from both species and a total of 4n(chromosome set four times of haploid organism)

Species I has 2n=10 (n = 5) and species II has 2n=12 (n = 6)

For allotetraploid there are 3 possible combination -

2n from both species I and species II - 10 + 12 = 22 chromosomes

3n from species I + 1n from species II : 3(5) + 1(6) = 21 chromosomes

1n from species I + 3n from species II : 1(5) + 3(6) = 23 chromosomes.