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	} elsif (defined $init && defined $init->{'phenotype'}) {
		my @possible = grep { $geno_pheno->{$_} eq $init->{'phenotype'} } keys %$geno_pheno;
		return undef unless @possible;
		$self->{'genotype'} = $possible[rand @possible];
	} else {
		my @possible = keys %$geno_pheno;
		$self->{'genotype'} = $possible[rand @possible];
	}

	return bless $self, $class;
}

=head2 $bt->get_bloodtype

Get the bloodtype (phenotype) of this person. Returns "A", "B", "AB", or "O".

=cut

sub get_bloodtype {
	my ($self) = @_;

	return $geno_pheno->{ $self->{'genotype'} };
}

=head2 $bt->get_genotype

Get the genotype of this person. Returns a string of two characters, which
may be "A", "B", or "O".

=cut

sub get_genotype {
	my ($self) = @_;
	return $self->{'genotype'};
}

=head2 $bt1->cross($bt2)

"Mate" one person with the other, producing a result chosen randomly in the
style of Mendel.

=cut

sub cross {
	my ($self, $other) = @_;

	die "Uh?" unless $other->isa(__PACKAGE__);

	my $from_self = substr $self->get_genotype, int rand 2, 1;
	my $from_other = substr $other->get_genotype, int rand 2, 1;

	return __PACKAGE__->new({ genotype => $from_self . $from_other });
}

=head1 AUTHOR

Andrew Rodland, C<< <ARODLAND at cpan.org> >>

=head1 BUGS

Please report any bugs or feature requests to
C<bug-acme-bloodtype at rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Acme-BloodType>.
I will be notified, and then you'll automatically be notified of progress on
your bug as I make changes.

=head1 SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Acme::BloodType

You can also look for information at:

=over 4

=item * AnnoCPAN: Annotated CPAN documentation

L<http://annocpan.org/dist/Acme-BloodType>

=item * CPAN Ratings

L<http://cpanratings.perl.org/d/Acme-BloodType>

=item * RT: CPAN's request tracker

L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Acme-BloodType>

=item * Search CPAN

L<http://search.cpan.org/dist/Acme-BloodType>

=back

=head1 ACKNOWLEDGEMENTS

=head1 COPYRIGHT & LICENSE

Copyright 2006 Andrew Rodland, all rights reserved.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut

1; # End of Acme::BloodType