Final answer:
An allotetraploid organism has four sets of chromosomes, with two sets coming from each of two different species. This condition leads to increased size and robustness in polyploid plants.
Step-by-step explanation:
The allotetraploid of question 49 is said to have four chromosome sets. An allotetraploid is an organism that has two sets of chromosomes from two different species, leading to a total of four sets of chromosomes. This condition is a type of polyploidy, which is more common in plants and can contribute to larger and more robust organisms compared to those with the normal number of chromosomes, or euploids. Polyploid plants, unlike polyploid animals, tend to be fertile and can normally undergo meiosis because they have an even number of chromosome sets, allowing for normal tetrad formation and chromosome separation.