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khanaamnaa539
27.03.2020 •
Biology
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
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Ответ:
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".
Ответ:
Thrust helps to move the rocket against gravity.
Explanation:
The amount of a rocket's thrust affect its trajectory because this thrust help the rocket to move against the gravity of the earth. More force in the form of thrust is needed by orbiting spacecraft to escape its orbit because the orbit does not allow the orbiting spacecraft to escape so for that force is needed to to against its orbit. First, we need to escape from the gravity of earth then go towards the mars. after entering the gravity of mass, we used a force which helps in safe landing on the mars.