Which one of the following factor do not allows Hardy-Weinberg principle to operate?

According to the Neo-Darwinian theory, which of the following is responsible for the origin of new species

In a species, the weight of newborn ranges from $2$ to $5\; \mathrm{kg} .97 \%$ of the newbom with an average weight between $3$ to $3.3\; \mathrm{kg}$ survive whereas $99 \%$ of the infants born with weights from $2$ to $2.5\; \mathrm{kg}$ or $4.5$ to $5 \;kg$ die. Which type of selection process is taking place?

The chance of elimination of genes from a small population is an example of

Identify the phenomenon in which a new set of population is formed the set of existing population due to the excessive change in the allele frequency

$^{\prime} XX ^{\prime}$ is a type of selection process in evolution $^{\prime} XX ^{\prime}$ promotes the population changes in one particular direction $^{\prime} XX ^{\prime}$ favours small or large sized individuals, mean size of population changes in $^{\prime} XX ^{\prime}$. Identify $^{\prime} XX^{\prime}$