Two diploid (2N) species of wheat are crossed T.aestivuma (N=15) and T.militinae (N=43), producing mostly infertile hybrid progeny. Rarely one of these progeny is particularly large and also fetrile. If one of these fertile hybrids was crossed back to a T.aestivum how many chromosomes would you expect to find in the somatic cells of the plants produced by this second cross?

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.