Answer:
(d)In ZZ/ZW case, the female has
heteromorphic (ZW) sex chromosomes and the male hashomomorphic (ZZ) sex
chromosomes. Thus, peacock shows ZZ/ZW sex determination type.
In platypus the sex determination is of
XX-XYtype. Both male and females has ten sex chromosome each. The male has XY,
XY, XY, XY, XY and female has XXXXXXXXXX.
In snails the sex determination
is environmentally induced, while in cockroaches it is of XX-XO types.
In this type Y-chromosome is
completely lacking. In this the presence puffs unpaired X-chromosomes
determines the masculin sex.
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