Answer:
The ZW is the sex-determination system for offsprings for some organisms such as birds, some reptiles etc.
According to this system, the females have the sex chromosomes Z and W. Males have the sex chromosome ZZ.
Females have a greater chance for expressing a recessive phenotype because they will need only one recessive allele on their Z chromosomes to express the recessive phenotype. On the contrary, males will have a lesser chance because in order to show the recessive phenotype they would require both the alleles on the Z chromosomes to be recessive.
In this inheritance, the heterogametic sx is the female, which has the ZW sx chromosomes and the male, ZZ.
Females have a greater chance of expressing a recessive phenotype because they will need only one recessive allele on their Z chromosomes to express the recessive phenotype. On the contrary, males will have a lower chance because to show the recessive phenotype they would require both alleles on the Z chromosomes to be recessive.
With this information, we can conclude that this type of inheritance occurs in some species of insects, fish, birds and reptiles. In this inheritance, the heterogametic sx is the female, which has the ZW sx chromosomes and the male, ZZ. As the female is heterogametic, she defines the sx of the offspring.
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