When one sex chromosome is lacking in female and males are homogametic, in that condition, the sex chromosomal representation is
a)	ZO-ZZ	b)	XY-XX	c)	XX-XO	d)	ZW-ZZ

(a)

ZO and ZZ type of sex determination. This mechanism occurs in certain buttterfiles and moths. The female is heterogametic and produces two types of eggs half with Z and half without Z-chromosome. The males have homomorphic sex chromosomes and is homogametic. It forms only one kind of sperms, each with Z-chromosome

Parents       Phenotypes     Male           Female

                      Genotypes      AA + ZZ      AA +ZO

Gametes                              A+Z, A+Z    A +Z, A+O

-generation 

ZO-ZZ type of sex determination