Question

During crossing why do new features are not present in the parents apear in the offsprings

Answer 1

Parent genes normally have pure genes , when they are crossbred you get the f1 progeny ,here the dominant characters like tall is expressed whereas the short is not .In  the offsprings both the short and tall traits are expressed where most of the plants are tall

to summarise the parents have all the traits but only the dominant traits are expressed

hope you understand

Answer 2

Answer:

During crossing over new features are present in the meiosis because they are a combination of the 2 parents or the 2 gametes which gave rise to the evolution of a new trait.  

Crossing over occurs during meiosis I, during this even non-homologous chromosomes tend to recombine causing the mixing of traits in the gene loci, this mixing of trait gives rise to a new character or trait that is present in the zygote.