# This code is part of the Biopython distribution and governed by its
# license.  Please see the LICENSE file that should have been included
# as part of this package.
#

"""Perform two-point crossovers between the genomes of two organisms.

This module performs single-point crossover between two genomes.

SinglePointCrossover:
genome 1 --       A B C*D E F
genome 2 --       a b c*d e f

new genome 1 --   A B C d e f
new genome 2 --   a b c D E F

"""
# standard modules
from .GeneralPoint import TwoCrossover


class SinglePointCrossover(TwoCrossover):
    """Perform point crossover between genomes at some defined rate.

    This performs a crossover between two genomes at some defined
    frequency.  Length of genome is preserved, as the crossover
    point is the same for either genome.
    """
    def __init__(self, crossover_prob=.1):
        """Initialize to do crossovers at the specified probability.
        """
        TwoCrossover.__init__(self, 1, crossover_prob)
