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B) ZZ-ZW method: The snake and the bird show upside down. New animals have a couple of sex chromosomes, one of which comes from mother and the other is from the father. When both parents give z chromosomes, the animal is the son (ZZ). On the other hand, the mother W chromosomes and the father Z chromosomes, the animal is the girl (ZW). In this method, the ZW animal is either heterogamatic (Z in half-genital cells and W chromosomes in half of the genes), whereas the male (ZZ) animal is homogamatic (Z chromosome in all genes). This method of sex determination is ZZ-ZW. The name is named after the XX-XY method, which is the mother's responsibility for sex determination, because the father is only in the genital cell Z is able to provide chromosomes but can give Z or W chromosomes in mother cells, depending on whether the child will be a baby or a girl, depending on whether the mother gives Z chromosomes in her genital area or the W chromosomes, snakes, birds, butterflies, some amphibians and fish. In this method the gender is determined.