SEX-LINKED TRAITS IN HUMANS AND
BIRDS.
Gender is determined
genetically by two sex chromosomes. In mammals, these are the X and Y
chromosomes, with males having XY chromosomes and females having XX. In mating,
the parents each contribute one sex chromosome. As a result, it is the male that,
genetically, determines the gender of the offspring. In birds, however, the sex
chromosomes are referred to as Z and W, with females having ZW chromosomes and
males having ZZ. In birds, therefore, it is the female that determines the
gender of the offspring.
HUMANS.
MALE XY
FEMALE XX
MALES
DETERMINE THE SEX OF THE OFFSPRING.
BIRDS.
MALE ZZ
FEMALE ZW
FEMALES
DETERMINE THE SEX OF THE OFFSPRING.
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