Geneticists working in an agriculture lab wanted to develop a crop that combines the disease resistance of rye grain with the high crop yielding capacity of wheat grain. Rye grain has a diploid chromosome number (2n) of 10 and wheat grain has a diploid chromosome number of 16. The resulting grain is called triticale and is an alloploidy plant. How many chromosomes are found in the pollen grain of triticale

the number would be 20 chromosomes, since being a diploid structure and presenting an n = 10 it would multiply by two.

Explanation:

As it is an alloploid cell, it must be taken into account that it is the definition of: "composed of 2 or more genomes of  different origin (of different species). They arise from crosses between individuals of different species or generation.

Using the technique of: obtaining a    hybrid and subsequent chromosomal duplication by  action of colchicine, some  alloloids with some stability and more or less   Improving success.  Triticales are a good example,  hybrids of rye and wheat, (Triticum eastivum  gives rise to octoploid triticales and Triticum durum  hexaploid triticales genera).  In both cases there are problems of  stability that relates to quantity  of heterochromatin from the chromosomes of  rye and with the regulation of diploidization  which is made by the wheat Ph1 gene  fundamentally and that by shortening the time of  mating causes some to be lost  rye chromosomes.  Large amounts of triticales have been obtained, currently being used as  forage plants but they are also used to take advantage of the seeds and they are already commercialized  with some success "tritiflakes".

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.