heterogametic sex The sex with two different chromosomes, such as males in humans and Drosophila.
Where the A gene is sex-linked, the heterogametic sex (e.g., mammalian males; avian females) have only one copy of the gene (and are termed hemizygous), while the homogametic sex (e.g., human females) have two copies.
Females are homogametic sex (X: or XX)
Males are heterogametic sex (XY) / Y chromosome is shorter
Involves whole chromosomes instead of individual genes
Phenotypic characteristic is inherited on X, not on Y chromosome ...
Their offspring are homozygous at every locus including having identical sex chromosomes. Thus the females produce all males because, unlike mammals, females are the heterogametic sex (ZW) while males are homogametic (ZZ).
 See also: Chromosome, Gene, Organ, Polyp, Alleles
  
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