public G gene() {
		return get(0).get(0);
	}
Return the first {@link Gene} of the first {@link Chromosome} of this
{@code Genotype}. This is an alias for
{@snippet lang="java":
final Genotype<DoubleGene> gt = null; // @replace substring='null' replacement="..."
final DoubleGene gene = gt.get(0).get(0);
}

@since 5.2

@return the first {@link Gene} of the first {@link Chromosome} of this
        {@code Genotype}.
jenetics/src/main/java/io/jenetics/Genotype.java