The theory of evolution of species by natural selection was given by

According to the evolutionary theory,the formation of a new species is generally due to:

Study the following cross showing self-pollination in $F_1$ generation,fill in the blank,and answer the question that follows:
Parents: $RRYY \times rryy$
(Round,yellow) (Wrinkled,green)
$F_1$: $RrYy \times$ ?
(Round,yellow)

When are the genetic traits of parents transmitted to the offspring?

$A$ very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation.

Which factor conducts the expressive genetic information from one generation to another?