B) Females are homogametic and males are heterogametic is the incorrect statement regarding ZW-ZZ type of sex determination.

Explanation:
The ZW-ZZ type of sex determination is observed in birds and some reptiles. This system is the opposite of the more common XY type of sex determination found in mammals, where males are heterogametic (XY) and females are homogametic (XX). In the ZW-ZZ system, the females are heterogametic (ZW) and the males are homogametic (ZZ).

1. ZW-ZZ type of sex determination:
- In this system, the female parent contributes two different sex chromosomes, Z and W, while the male parent contributes two identical sex chromosomes, Z and Z.
- Offsprings that receive a Z chromosome from both parents develop into males (ZZ), while those that receive a Z chromosome from the male parent and a W chromosome from the female parent develop into females (ZW).
- The presence of the W chromosome determines the development of the female phenotype.

2. Incorrect statement:
b) Females are homogametic and males are heterogametic - This statement is incorrect because, in the ZW-ZZ type of sex determination, females are heterogametic (ZW) and males are homogametic (ZZ). It is the opposite of the typical XY system found in mammals.

3. Correct statements:
a) It occurs in birds and some reptiles - This statement is correct. The ZW-ZZ type of sex determination is commonly found in birds, including chickens, ducks, and pigeons, as well as some reptiles, such as snakes and turtles.

c) 1:1 sex ratio is produced in the offspring - This statement is correct. In the ZW-ZZ system, the sex ratio of the offspring is generally equal, producing a 1:1 ratio of males to females.

In summary, the incorrect statement regarding ZW-ZZ type of sex determination is that females are homogametic and males are heterogametic. In this system, females are heterogametic (ZW) and males are homogametic (ZZ). The ZW-ZZ system is observed in birds and some reptiles and typically produces a 1:1 sex ratio in the offspring.